Tap

Abstract

To provide a tap in which a coolant is supplied to all tap grooves and chips are discharged to the outside of a prepared hole in any screw forming operation of the prepared hole of a blind hole form and a through hole form.SOLUTION: Since a groove cross-sectional area of a first coolant feed groove 10a for feeding a coolant to a first tap groove 9a (which functions as a chip discharge groove at the time of blind hole formation) is a groove cross-sectional area smaller than the groove cross-sectional area of the coolant feed groove for feeding the coolant to a second tap groove 9b to a fourth tap groove 9d which are chip entry blocking grooves, the coolant fed to the second tap groove 9b to the fourth tap groove 9d flows into a first tap groove 9a together with the chips, moves, and is discharged to the outside from a prepared hole opening at the time of blind hole formation, and the coolant in the first coolant feed groove 10a reaches a tip of the first tap groove 9a to cool the tip at the time of through hole formation.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a tap characterized by a coolant (cutting oil) supply form.

Background Art

[0002] Conventionally, in a tap, as a form of supplying coolant to a tap groove of a threaded portion, there is known a tap provided with a coolant supply groove (outer peripheral groove) in a groove form in which coolant flows on the outer periphery of the shank from the rear end side of the shank toward the tap groove. (For example, Patent Document 1)

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] <Through - hole cutting tap> In the technique of Patent Document 1 described above, when the pilot hole for forming a thread with a cutting tap is a through - hole, a coolant supply groove (side through groove 16 in Patent Document 1) for supplying coolant to each of all the tap grooves is provided corresponding to each tap groove on the outer periphery of the shank (the number of tap grooves and the number of coolant supply grooves are the same). (For example, in the tap of FIG. 2 of Patent Document 1, a form in which four coolant supply grooves are provided for each of the four tap grooves).

[0005] And its feature is that the four coolant supply grooves have the same groove depth and the same groove width, and coolant is ejected at the same ejection amount and ejection speed from the center (from the center) of each tap groove. By supplying coolant to all the tap grooves (here, explained with four tap grooves), each of the cutting chips cut out into each of the four tap grooves by the cutting operation of the cutting edges (all the cutting edges) of the four threaded portions is The chips cut by the coolant sprayed into the tap groove can be prevented from remaining in the tap groove, thus preventing the chips from biting into the thread for a certain period of time. They are forced to be pushed out and discharged below the counterbore. It is to cool all the cutting edges of the engaged part with coolant to reduce cutting resistance and cutting friction.

[0006] <Counterbore Cutting Tap> Regarding the technology of Patent Document 1 described above, when the counterbore for forming a thread with a cutting tap is a blind hole, a configuration is adopted in which coolant is not supplied to some of the tap grooves, and no coolant supply groove is provided from the tap grooves where coolant is not supplied to the rear end of the shank (for example, in the tap shown in FIG. 4 of Patent Document 1, two coolant supply grooves are provided for each of the two tap grooves out of the four tap grooves, and coolant is not supplied to the other two tap grooves).

[0007] During the cutting of the counterbore (blind hole), coolant is sprayed and supplied to two tap grooves. After the coolant and chips in the coolant supply tap groove (the tap groove where coolant is supplied) flow into the space between the counterbore and the tap tip, they flow into the coolant non - supply tap groove (the tap groove where coolant is not supplied), and together with the chips generated by the cutting edge on the coolant non - supply tap groove side, they rise along the coolant non - supply tap groove and are discharged outside the counterbore.

[0008] <Problems of Through - hole Cutting Tap> When the above-mentioned cutting tap for holes is used for cutting a blind hole, since coolant is injected into all the tap grooves at the same flow rate, the same flow volume, the same groove width, and the same groove depth, the openings of the discharge grooves for the coolant and chips formed by the pilot hole being tapped and the tap grooves are covered by the coolant, making it difficult for the coolant and chips to be discharged from the tap grooves (remaining in the tap grooves). This causes problems such as chips biting into the threaded part, poor cooling due to a significantly deteriorated coolant flow, and an increase in frictional resistance.

[0009] <Problems of the cutting tap for blind holes> When the above-mentioned cutting tap for blind holes is used for cutting a through hole (thread forming), coolant is jet-supplied to two coolant supply tap grooves, but the coolant simply flows out below the pilot hole and is discharged (released) together with the chips from the lower opening of the pilot hole and the coolant supply tap grooves. However, no coolant is supplied to the other two non-coolant supply tap grooves, resulting in a drawback that cooling of the cutting edge on the non-coolant supply tap groove side, reduction of frictional resistance, and prompt discharge of chips cannot be effectively performed.

[0010] Therefore, the cutting tap of the invention of Patent Document 1 has the following problems. (A) The cutting tap for through holes is difficult to use for thread forming of blind holes, and the cutting tap for blind holes is difficult to use for thread forming of through holes. (B) In a thread forming environment where thread forming of blind holes and through holes coexists, two types of taps, namely, a cutting tap for through holes and a cutting tap for blind holes, must be prepared, and thread forming must be performed using two cutting devices or by changing the taps while using one cutting device. (C) Since the cutting tap for through holes and the cutting tap for blind holes have the same form except for the coolant supply grooves, there is a possibility of misidentifying the type of tap used.

[0011] Also, the coolant is injected and supplied at the center of the tap groove. However, the state of the wind pressure (air flow) generated in the tap groove outside the counterbore (in the tap groove that has not yet entered the counterbore) by the cutting rotation of the tap operation is in a state where the wind pressure per cutting edge surface hits the rake face, which is the rising surface on the cutting edge side, toward the cutting edge side. Therefore, the coolant in the tap groove that has not entered the counterbore has the drawback that a considerable amount is pushed out of the tap groove together with the wind per cutting edge surface, and the amount of coolant supplied to the biting part side during the cutting operation is reduced. And when the counterbore is a blind hole, it means that the amount of coolant for discharging chips is reduced, which has the drawback that there is a possibility that the chips cannot be discharged sufficiently.

[0012] In the invention of Patent Document 1, the groove bottom of the coolant supply groove (in Patent Document 1, the side through groove 16) is configured not to reach the groove bottom of the tap groove 15. However, it is appropriate that the groove bottom has the same groove depth as the groove bottom of the tap groove 15 even when formed deepest. Therefore, the groove end portion of the coolant supply groove is at a position far from the tap tip (biting part) (in FIG. 1, the rearmost end position of the threaded portion). However, the coolant flowing through the coolant supply groove is in a state of spreading and scattering in the tap groove with a wide groove width at the groove end portion, and is in a state of decreasing scattering speed where the speed decreases significantly. In this state of decreasing scattering speed, especially from the start of cutting the counterbore (start of thread formation) to some progress of cutting, the tap groove is located in the open space that has not entered the counterbore between the biting part during the cutting operation and the groove end portion of the coolant supply groove. Therefore, most of the coolant that has reached the state of decreasing scattering speed at the groove end portion scatters into the open space, and the supply amount of coolant to the biting part during cutting is small and the supply momentum is weak. Therefore, during the cutting process for a certain period after the start of cutting the pilot hole (start of thread formation), there is a high possibility of insufficient chip discharge force where the coolant flow rate and the chip discharge force, which is the coolant momentum to push the chips below the tap groove (in the direction of thread formation progress of the tap) (push out the tip of the tap), cannot be obtained. During this insufficient chip discharge force, chips may remain in the tap groove and get caught, risking tap groove clogging due to the formation of chip clumps, which is a drawback of this kind of tap.

[0013] In view of the drawbacks of the prior art as described above, the present invention provides a tap that supplies coolant to the tap groove through a coolant supply groove connected to the tap groove. (1) In the thread forming operation for any of the pilot holes in the form of a blind hole or a through hole, coolant is supplied to all the tap grooves (including the grooves of rolled taps), and when chips are generated, the chips are discharged outside the pilot hole. The purpose is to provide a tap (including cutting taps and rolled taps). (2) Also, the purpose is to provide a tap (including cutting taps and rolled taps) that can supply a larger amount of coolant to the threading part side during the threading operation. (3) Also, the purpose is to provide a tap (including cutting taps and rolled taps) with high torsional strength. (4) Also, the purpose is to provide a tap (including cutting taps and rolled taps) that ensures the supply amount or per-unit momentum of coolant from the start of thread formation in the pilot hole to the threading part.

Means for Solving the Problems

[0014] To achieve the above object, the present invention has the following configuration. [Invention 1 A tap body having a plurality of thread parts including a threading part and a full thread part, and a shank part communicating with the thread part. A tap groove formed between adjacent thread parts. ​A coolant supply groove provided on the outer periphery of the shank portion for supplying coolant from the rear end side of the shank portion to all or some of the tap grooves. All or part of the groove form of the coolant supply groove is a non-through groove form in which the groove extends to a position of at least 1 / 3 of the tap groove in the range of the complete thread portion and has a groove end point (82), or a through groove form without the groove end point (82) penetrating the tap groove. The tap is characterized by this. [Invention 2 A tap body having a plurality of thread portions including a biting portion and a complete thread portion, and a shank portion communicating with the thread portion. A tap groove formed between adjacent thread portions. A coolant supply groove provided on the outer periphery of the shank portion for supplying coolant from the rear end side of the shank portion to all or some of the tap grooves. All or part of the form of the tap groove is a shallow tap groove portion in a form of a shallow groove extending from the shank side toward the tap tip, and a deep tap groove portion located on the tap tip side from the shallow tap groove portion and extending toward the tap tip in a groove form deeper than the shallow tap groove portion. The tap groove form has these. The length of the shallow tap groove portion is in a form of a length extending to a position of at least 1 / 3 of the tap groove in the range of the complete thread portion. The tap is characterized by this. [Invention 3 The shallow tap groove portion is in a form in which the coolant supply groove is formed in a through form. The tap according to the invention as described above is characterized by this. 2 The tap described. [Invention 4 A tap body having a plurality of thread portions including a biting portion and a complete thread portion, and a shank portion communicating with the thread portion. A tap groove formed between adjacent thread portions. A coolant supply groove provided on the outer periphery of the shank portion for supplying coolant from the rear end side of the shank portion to all or some of the tap grooves.​​​ In all or part of the axial direction of the tapping groove, a raised portion is provided which rises from the groove bottom of the tapping groove and connects to the shank portion in a rising form and is within the range of the complete thread portion toward the tap tip side. The tap is characterized by this. [Invention 5 The raised portion is in a form in which the coolant supply groove is formed. The tap according to the invention as described above is characterized by this. 4 The tap described above. [Invention 6] A tap body having a plurality of thread portions including a biting portion and a complete thread portion, and a shank portion connecting to the thread portion. A tapping groove formed between adjacent thread portions. A coolant supply groove provided on the outer periphery of the shank portion for supplying coolant from the rear end side of the shank portion to all or some of the tapping grooves. In all or part of the tapping groove, a partition wall is provided at a height that does not contact the female thread formed in the pilot hole, and is formed in a form that connects to the shank portion and is within the range of the complete thread portion toward the tap tip side. The tapping groove 9d is divided into two grooves by the partition wall, and a back surface side groove and a cutting surface side groove are formed. The tap is characterized by this. [Invention 7] The coolant supply groove is communicated with the back surface side groove or the cutting surface side groove. The tap according to the invention 6 as described above is characterized by this. [Invention 8 A tap body having a plurality of thread portions with a thread engaging portion and a complete thread portion, and a shank portion communicating with the thread portion A tap groove formed between adjacent thread portions A coolant supply groove provided on the outer periphery of the shank portion for supplying coolant from the rear end side of the shank portion to all or some of the tap grooves When the pilot hole for forming the female thread is a blind hole A part of the tap groove functions as a chip entry prevention groove The chip entry prevention groove is in a form in which the coolant supply groove is connected, and by the amount and momentum of the supplied coolant or either one of them, chips are discharged into the pilot hole space that spreads toward the tip of the thread portion, and functions as a groove that does not allow the chips to enter the chip entry prevention groove The tap groove other than the chip entry prevention groove functions as a chip discharge groove in which the coolant entraining the chips discharged from the chip entry prevention groove into the pilot hole space moves in the groove so as to be discharged outside from the pilot hole opening which is the opening of the pilot hole The groove width of the chip entry prevention groove is a groove width form narrower than the groove width of the chip discharge groove ​​In the chip entry prevention groove, the groove form of the coolant supply groove communicating with the chip entry prevention groove is a non-through groove form in which the groove extends to a position of at least about one-third of the tap groove within the range of the complete thread portion and has a groove end point (82), or a through groove form without the groove end point (82) penetrating the tap groove. A tap characterized by this. [Invention 9] A tap body having a plurality of thread portions with a thread engaging portion and a complete thread portion, and a shank portion communicating with the thread portion A tap groove formed between adjacent thread portions A coolant supply groove provided on the outer periphery of the shank portion for supplying coolant from the rear end side of the shank portion to all or some of the tap grooves When the pilot hole for forming the female thread is a blind hole A part of the tap groove functions as a chip entry prevention groove The chip entry prevention groove is in a form in which the coolant supply groove is connected, and by the amount and momentum of the supplied coolant or either one of them, chips are discharged into the pilot hole space that spreads toward the tip of the thread portion, and functions as a groove that does not allow the chips to enter the chip entry prevention groove The tap groove other than the chip entry prevention groove functions as a chip discharge groove in which the coolant entraining the chips discharged from the chip entry prevention groove into the pilot hole space moves in the groove so as to be discharged outside from the pilot hole opening which is the opening of the pilot hole The groove width of the chip entry prevention groove is a groove width form narrower than the groove width of the chip discharge groove The groove form of the chip entry prevention groove is a tap groove form having a shallow tap groove portion that is a shallow groove form extending from the shank side toward the tip of the tap, and a deep tap groove portion that is located on the tip side of the tap from the shallow tap groove portion and has a groove form deeper than the shallow tap groove portion. The coolant supply groove communicating with the chip entry prevention groove is in a shallow groove penetration form that penetrates the shallow tap groove portion, and is a form in which coolant is discharged to the deep tap groove portion. A tap characterized by this.

Advantages of the Invention

[0015] [Invention 1 's effects] In a tapping groove where the coolant supply groove is in a non-through groove form extending to a position of at least approximately 1 / 3 of the tapping groove within the range of the full thread portion and having a groove end point (82), or in a through groove form without a groove end point (82) penetrating the tapping groove, the coolant reaches a position of at least approximately 1 / 3 of the tapping groove within the range of the full thread portion (a position closer to the biting portion) and scatters at the groove end point (82). Thus, a form is realized in which more coolant reaches the tip side (biting portion) of the tapping groove. Or, in a through groove form where the coolant supply groove reaches and penetrates to the tip of the tapping groove, a form is realized in which more coolant reaches the tip side (biting portion) of the tapping groove, achieving the following operational effect. [Effect of the Invention 2 Providing a shallow form portion in the tapping groove results in an increase in wall thickness by that amount. Thus, the torsional strength of the tap is enhanced, realizing a tap with high durability that is difficult to break, achieving the following operational effect. [Effect of the Invention 3 The above invention 2 exhibits the same operational effect. Also, since the coolant supply groove is formed in a penetrating form in the shallow form portion, and since it is possible to make the groove depth of the coolant supply groove portion formed in the shallow form portion into a deep groove form, the coolant supplied by the coolant supply groove is realized to be released more vigorously by the deep tapping groove portion. Therefore, a form is achieved in which more coolant reaches the tip side (biting portion) of the tapping groove vigorously, achieving the following operational effect. [Effect of the Invention 4 Since it has a tapping groove provided with a raised portion formed in a form that rises from the groove bottom, connects to the shank portion, and is within the range of the full thread portion toward the tap tip side, the torsional strength is enhanced by the wall thickness of the raised portion, achieving the following operational effect. [Effect of the Invention 5 The above invention 4 ​​​​It has the same operational effects, and since the coolant supply groove is formed in the raised portion, it has the effect of being able to deliver more coolant vigorously to the tap center side. [Effect of the Invention 6 In a tap having a coolant supply groove, a partition wall is provided which is formed in a form that connects to the shank portion and is within the range of the full thread portion toward the tap tip side, and by this partition wall, a back surface side groove and a cutting surface side groove are formed. Therefore, the coolant supply groove can be connected to the back surface side groove or the cutting surface side groove. Since the back surface side groove or the cutting surface side groove is in a narrow groove form, it reduces the scattering of the coolant discharged from the coolant supply groove and enables an increase in the amount of coolant reaching the tap tip. Also, it realizes an enhancement of the torsional strength by the partition wall, and has the effect of achieving such an effect. [Effect of the Invention 7 The said invention 6 has the same operational effects. [Effect of the Invention 8 In the case where the pilot hole forming the female thread is a blind hole, the chip entry prevention groove realizes a form in which chips do not enter the chip entry prevention groove by the coolant supplied thereto, and the chip discharge groove is a coolant supply groove that supplies coolant to the chip discharge groove, and the chip discharge groove connecting coolant supply groove has a coolant supply form in which the coolant containing chips cannot be prevented from entering the chip discharge groove and being discharged to the outside from the pilot hole opening, and therefore realizes a form in which the coolant containing chips released from the chip entry prevention groove into the pilot hole space moves within the groove so as to be discharged to the outside from the pilot hole opening, which is the opening of the pilot hole, In the case where the pilot hole is a through hole, the coolant supplied from the chip discharge groove communication coolant supply groove flows through the chip discharge groove, reaches the tip side of the threaded portion, and cools the tip side. Therefore, whether the thread is formed in a blind hole or a through hole, this has the advantageous effect of realizing a tap that allows coolant to reach and cool all of the tap grooves and all of the cutting edges of the chamfer at their tips. Since only one type of tap can be used, which is a tap for both pilot holes, there is no need to manage taps for blind holes and taps for through holes separately, and mistakes such as using a through hole tap for a blind hole can be prevented, thereby simplifying the management of taps. Since the groove width of the chip entry prevention groove is narrower than the groove width of the chip discharge groove, the curling of the chips can be reduced and the breaking of the chips is accelerated, promoting the formation of short chips. In addition, the amount of scattering and weakening of the momentum of the coolant flowing through the chip entry prevention groove are suppressed, allowing more coolant to reach the tip of the tap. In the chip entry prevention groove, the coolant supply groove is in a non-through groove form that extends to a position of at least approximately 1 / 3 or more of the tap groove within the range of the full thread portion and has a groove end point (82), or in a tap groove in a through groove form without a groove end point (82) penetrating the tap groove. Since the coolant reaches a position of at least approximately 1 / 3 or more of the tap groove within the range of the full thread portion (a position closer to the biting portion) and scatters at the groove end point (82), it realizes a form in which more coolant reaches the tip side (biting portion) of the tap groove. Or, in a through groove form where the coolant supply groove reaches and penetrates to the tip of the tap groove, it realizes a form in which more coolant reaches the tip side (biting portion) of the tap groove, and has the effect of achieving such an effect. [Effect of the Invention 9 ​​​Effect In the case where the pilot hole forming the female thread is a blind hole, the chip entry prevention groove realizes a form in which chips do not enter the chip entry prevention groove by the coolant supplied thereto, and the chip discharge groove is a coolant supply groove that supplies coolant to the chip discharge groove, and the chip discharge groove connecting coolant supply groove has a coolant supply form in which the coolant containing chips cannot be prevented from entering the chip discharge groove and being discharged to the outside from the pilot hole opening, and therefore realizes a form in which the coolant containing chips released from the chip entry prevention groove into the pilot hole space moves within the groove so as to be discharged to the outside from the pilot hole opening, which is the opening of the pilot hole, In the case where the pilot hole is a through hole, the coolant supplied from the chip discharge groove communication coolant supply groove flows through the chip discharge groove, reaches the tip side of the threaded portion, and cools the tip side. Therefore, whether the thread is formed in a blind hole or a through hole, this has the advantageous effect of realizing a tap that allows coolant to reach and cool all of the tap grooves and all of the cutting edges of the chamfer at their tips. Since only one type of tap can be used, which is a tap for both pilot holes, there is no need to manage taps for blind holes and taps for through holes separately, and mistakes such as using a through hole tap for a blind hole can be prevented, thereby simplifying the management of taps. Since the groove width of the chip entry prevention groove is narrower than the groove width of the chip discharge groove, the curling of the chips can be reduced and the breaking of the chips is accelerated, promoting the formation of short chips. In addition, the amount of scattering and weakening of the momentum of the coolant flowing through the chip entry prevention groove are suppressed, allowing more coolant to reach the tip of the tap. Providing a shallow form part in the tap groove means that the wall thickness increases accordingly, enhancing the torsional strength of the tap and realizing a durable tap that is difficult to break. Since the coolant supply groove is formed in a penetrating form in the shallow form part, and the groove depth of the coolant supply groove part formed in the shallow form part can be made into a deep groove form, the coolant supplied by the coolant supply groove is realized to be released more powerfully by the deep tap groove part. Therefore, the coolant reaches the tip side (thread engagement part) of the tap groove more powerfully, achieving the above-described function and effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] [Figure 1] Front view (drawing a), plan view (drawing b), and enlarged right side view (drawing c) of Example 1 of the present invention. [Diagram 2] Front view (drawing a), plan view (drawing b), and enlarged right side view (drawing c) of Example 2 of the present invention. [Diagram 3] Front view (drawing a) and enlarged right side view (drawing b) of Example 3 of the present invention. [Figure 4] Right side view of Example 4 of the present invention. [Diagram 5] Right side view of Example 5 of the present invention. [Figure 6] Right side view of Example 6 of the present invention. [Figure 7] Right side view of Example 7 of the present invention. [Figure 8] Right side view of Example 8 of the present invention. [Figure 9] Front view (drawing a), plan view (drawing b), and enlarged right side view (drawing c) of Example 9 of the present invention. [Figure 10] Front view (drawing a), plan view (drawing b), and enlarged right side view (drawing c) of Example 10 of the present invention. [Figure 11]Front view (Figure a), plan view (Figure b), and enlarged right side view (Figure c) of Example 11 of the present invention. [Figure 12] Right side view of Example 12 of the present invention. [Figure 13] Right side view of Example 13 of the present invention. [Figure 14] Front view (Figure a), plan view (Figure b), and enlarged right side view (Figure c) of Example 14 of the present invention. [Figure 15] Front view of Example 15 of the present invention. [Figure 16] Plan view (Figure a), cross-sectional view taken along line W-W (Figure b), and cross-sectional view taken along line X-X (Figure c) of Example 16 of the present invention. [Figure 17] Right side view of Example 16 of the present invention. [Figure 18] Right side view of Example 17 of the present invention. [Figure 19] Right side view of Example 18 of the present invention. [Figure 20] Plan view (Figure a) and enlarged right side view (Figure b) of Example 19 of the present invention. [Figure 21] Plan view (Figure a) and enlarged right side view (Figure b) of Example 20 of the present invention. [Figure 22] Plan view (Figure a) and enlarged right side view (Figure b) of Example 21 of the present invention. [Diagram 23] Plan view (Figure a) and enlarged right side view (Figure b) of Example 22 of the present invention. [Figure 24] Plan view (Figure a), cross-sectional view taken along line Y-Y (Figure b), and cross-sectional view taken along line Z-Z (Figure c) of Example 23 of the present invention. [Diagram 25] Front view (Figure a), plan view (Figure b), and enlarged right side view (Figure c) of Example 24 of the present invention. [Figure 26] Right side view of Example 25 of the present invention. [Figure 27] Right side view of Example 26 of the present invention.

Modes for Carrying Out the Invention

[0017] Hereinafter, examples of the best mode for carrying out the present invention will be described. However, it is not intended that the present invention be limited to these examples. In addition, in the description of the following examples, the same components as those in the above-mentioned examples will be designated by the same reference numerals, and duplicated descriptions will be omitted. EXAMPLES

[0018] In the first embodiment of the present invention shown in FIG. 1, a cutting tap 1 has the following configuration. [Definition] (1) The term "chip entry prevention groove" refers to a tap groove that, when the pilot hole forming the female thread is a blind hole, functions as a groove that releases (pushes) chips into the pilot hole space, which is the space of the pilot hole that extends beyond the threaded portion, depending on the amount and / or force of coolant supplied, thereby preventing the chips from entering the chip entry prevention groove. (2) "Chip discharge groove (a form that functions as a groove that does not allow chips to enter)" refers to a tap groove that functions as a chip discharge groove that moves within the groove so that, when the pilot hole forming the female thread is a blind hole, the coolant containing the chips released from the chip entry prevention groove into the pilot hole space is discharged to the outside from the pilot hole opening, which is the opening of the pilot hole. (3) "Chip discharge groove connecting coolant supply groove" refers to a coolant supply groove that is connected to the chip discharge groove and supplies coolant to the chip discharge groove, In the case where the pilot hole is a through hole, the coolant supplied from the chip discharge groove communication coolant supply groove flows through the chip discharge groove, reaches the tip side of the threaded portion, and cools the tip side. When the pilot hole is a blind hole, the groove has a coolant supply form (for example, a coolant supply form in terms of the amount and force of coolant, or either one of the coolant supply forms) that cannot prevent coolant containing chips released in the chip entry prevention groove from entering the chip discharge groove and being discharged to the outside from the pilot hole opening. This also applies to the following examples.

[0019] A tapping body 7 having a biting portion 2 for cutting and forming an internal thread, a plurality of thread portions 4 (a first thread portion 4a, a second thread portion 4b, a third thread portion 4c, a fourth thread portion 4d) composed of a complete thread portion 3, a shank portion 5, and a square portion 6 provided at the tip (rear end) of the shank portion 5. The number of thread portions 4 for cutting and forming an internal thread in the pilot hole A may be two, three, five, or more. Tap grooves formed between adjacent thread portions 4 (here, a first tap groove 9a (chip discharge groove) is formed between the first thread portion 4a and the second thread portion 4b, a second tap groove 9b (chip entry prevention groove) is formed between the second thread portion 4b and the third thread portion 4c, a third tap groove 9c (chip entry prevention groove) is formed between the third thread portion 4c and the fourth thread portion 4d, and a fourth tap groove 9d (chip entry prevention groove) is formed between the fourth thread portion 4d and the first thread portion 4a). Coolant supply grooves (here, a first coolant supply groove 10a (chip discharge groove connection coolant supply groove) for supplying coolant (which may be supplied in liquid form, mist form, etc.) provided on the outer periphery of the shank portion 5 to each of all the tap grooves from the rear end side of the shank portion 5, a second coolant supply groove 10b for supplying coolant to the second tap groove 9b (chip entry prevention groove), a third coolant supply groove 10c for supplying coolant to the third tap groove 9c (chip entry prevention groove), and a fourth coolant supply groove 10d for supplying coolant to the fourth tap groove 9d (chip entry prevention groove)), and at least the same number of coolant supply grooves as the number of tap grooves are provided. At least one of the coolant supply grooves (here, one of the first coolant supply grooves 10a, but it may also be a plurality) is a chip discharge groove connection coolant supply groove having a different groove width, a different groove depth, or different groove width and different groove depth from other coolant supply grooves (here, the second coolant supply groove 10b, the third coolant supply groove 10c, the fourth coolant supply groove 10d), that is, the first coolant supply groove 10a having different groove depths. The groove cross-sectional area of the first coolant supply groove 10a (the chip discharge groove connecting coolant supply groove) is a smaller cross-sectional area than the groove cross-sectional areas of the other coolant supply grooves (however, excluding the form in which a through-hole-shaped through coolant supply hole is provided in a through-hole form from the rear end side of the shank 5 to the tip side of the threaded portion 4 for supplying coolant from the rear end side of the shank 5 and discharging it from the tip side of the threaded portion 4).

[0020] A coolant reservoir 11 in the form of a hole is formed at the rear end of the shank portion 5, and coolant introduction grooves for introducing coolant from the coolant reservoir 11 into each of the coolant supply grooves are provided (here, a first coolant introduction groove 12a for supplying to the first coolant supply groove 10a is provided, a second coolant introduction groove 12b for supplying to the second coolant supply groove 10b is provided, a third coolant introduction groove 12c for supplying to the third coolant supply groove 10c is provided, and a fourth coolant introduction groove 12d for supplying to the fourth coolant supply groove 10d is provided.). The groove cross-sectional area of the coolant introduction groove 12a of the first coolant supply groove 10a (the chip discharge groove connecting coolant supply groove) is a smaller cross-sectional area than the groove cross-sectional areas of the coolant introduction grooves of the other coolant supply grooves.

[0021] The first coolant supply groove 10a, which is the chip discharge groove connecting coolant supply groove, is also a small coolant supply groove with a smaller jet supply amount of coolant than the other coolant supply grooves. The groove widths of all the coolant supply grooves are the same, and the groove depths of the other coolant supply grooves (the second coolant supply groove 10b to the fourth coolant supply groove 10d) are the same and are deeper than the groove depth of the first coolant supply groove 10a. All the coolant supply grooves and all the coolant introduction grooves are positioned on the approximate center line B of each tap groove.

[0022] The phrase "the position provided on the approximate center position line B of each tapping groove" includes any form in which the coolant supply groove reaches the tapping groove, any form in which the coolant supply groove does not reach the tapping groove, and any form in which the coolant is jetted and supplied to the tapping groove. The same applies to the following inventions.

[0023] The form in which a through coolant supply hole (center through hole) provided in a through hole form from the rear end side of the shank portion 5 to the tip side of the threaded portion 4 for supplying coolant from the rear end side of the shank 5 and discharging it from the tip side of the threaded portion 4 is not provided means excluding from this embodiment the form in which a through coolant supply hole (center through hole) is provided in a through hole form from the rear end side of the shank portion 5 to the tip side of the threaded portion 4. The same applies to the taps in the following embodiments. Also, the cutting edge portion of the biting portion at the part where the tapping groove is a chip entry prevention groove is preferably in a point tap blade form or a point tap groove form in which the chips are discharged in the same direction as the traveling direction. The same applies to the cutting taps in the following embodiments.

[0024] The following effects are achieved. (1) In the cutting thread formation of the pilot hole A as a through hole, coolant is supplied to all the tapping grooves (tapping grooves 9a to 9d). Although the coolant supply amount from the chip discharge groove communication coolant supply groove (the first coolant supply groove 10a) is small compared to the supply amounts from the other coolant supply grooves (the second coolant supply groove 10b to the fourth coolant supply groove 10d) (due to the groove cross-sectional area of the chip discharge groove communication coolant supply groove being smaller than that of the other coolant supply grooves), even in the tapping groove receiving the jet supply from such a chip discharge groove communication coolant supply groove, the cutting edge is cooled by the supplied coolant, the frictional resistance is reduced, and the cut chips are pushed downward by the coolant and quickly discharged from the lower opening of the pilot hole A. (2) In the formation of the counterbore A for the stop hole thread, the supply amount of the coolant from the chip discharge groove communication coolant supply groove (the first coolant supply groove 10a) to the tap groove 9a (chip discharge groove) is less than the supply amount of the coolant from each of the other coolant supply grooves (the second coolant supply groove 10b to the fourth coolant supply groove 10d) to the tap grooves 9b to 9d (chip entry prevention grooves). On the other hand, the amount of coolant supplied to the other coolant supply grooves is larger than the amount of coolant supplied from the chip discharge groove communication coolant supply groove to the tap groove (chip discharge groove). Therefore, in the thread formation of the stop hole, the coolant (including chips) in the other coolant supply grooves (the second coolant supply groove 10b to the fourth coolant supply groove 10d) pushes up and displaces the coolant (including chips) in the chip discharge groove communication coolant supply groove (the first coolant supply groove 10a), or changes the flow direction to the side with weaker influence of the coolant in the first coolant supply groove 10a (chip discharge groove communication coolant supply groove), and then rises through the tap groove 9a (chip discharge groove) to realize the discharge of the coolant and chips from the upper opening of the counterbore A (accurately, the tap groove hole formed by the counterbore 10a (represented by a two-dot chain line) and the tap groove 9a). That is, a cutting tap that can be used without problems in the use of the stop hole is realized. (3) From (1) and (2) above, a cutting tap that realizes a cooling effect, a friction reduction effect, and a chip discharge effect in both the use of a through hole and the use of a stop hole (hereinafter also referred to as "a tap corresponding to both counterbores") is realized. For example, when a combination of forming the same-diameter thread in a stop hole and forming the same-diameter thread in a through hole exists, it can be dealt with by using one type of the same-diameter cutting tap. For example, since the cutting tap can be made to be only one type of the tap corresponding to both counterbores, there is no need to manage the taps separately for the stop hole and the through hole, and mistakes such as using a through-hole tap for a stop hole can be avoided, simplifying the management of the taps.

Example

[0025] In Example 2 of the present invention shown in FIG. 2, the main difference from Example 1 is that a cutting tap 20 is formed in which the first coolant supply groove is the first coolant supply groove 21a and the first coolant introduction groove is the first coolant introduction groove 22a. The first coolant supply groove 21a has a groove opening position closer to the second thread portion 4b side (position on the rake face 14b side) in the right side view, a groove depth substantially the same as that of other coolant supply grooves (the second coolant supply groove 10b to the fourth coolant supply groove 10d), and a groove width narrower than that of the other coolant supply grooves. Also, taking the tap groove portion within the range of the thread portion 4 as the thread portion range groove portion (the tap groove portion within the range of the complete thread portion 3 as the complete thread portion range groove portion), the first coolant supply groove 21a extends in a groove depth form in which a groove is engraved (formed) on the groove bottom of the tap groove located in the thread portion range groove portion through the communicating first tap groove 9a (chip discharge groove), and its groove end point 82 is positioned such that the coolant flowing through the coolant supply groove is not obstructed or its flow direction is changed, causing the coolant to scatter and hit the biting portion 2 well. The length of the first coolant supply groove 21a (= the length to the groove end point 82) is preferably 1 / 3 or more of the length of the thread portion range groove portion (the tap groove portion within the range of the thread portion 4), more preferably half or more, still more preferably 2 / 3 or more, and most preferably the length at which the scattered coolant reaches the groove end point 82 and hits the biting portion 2 well. The first coolant introduction groove 22a has a groove opening position closer to the second thread portion 4b side (a position close to the rake face 14b) in the right side view, and its groove width is also substantially the same as that of the first coolant introduction groove 22a. The groove widths of the second coolant introduction groove 12b to the fourth coolant introduction groove 12d communicating with other coolant supply grooves (the second coolant supply groove 10b to the fourth coolant supply groove 10d) are substantially the same as the groove widths of the other coolant supply grooves. The first coolant supply groove 21a is a chip discharge groove connecting coolant supply groove, a small amount coolant supply groove, and also a differently arranged coolant supply groove (a form in which the arrangement position in the tap groove is different from that of other coolant supply grooves).

[0026] In the case of use in a blind hole, the first tap groove 9a that receives coolant supply from the first coolant supply groove 21a functions as a chip discharge groove. In that case, since the coolant flowing in the first tap groove 9a (chip discharge groove) is supplied from the side of the scraping surface 14b, the amount and momentum of the coolant near the back surface 15a become weak, whereby the coolant and chips of other coolant supply grooves (the second coolant supply groove 10b to the fourth coolant supply groove 10d) easily flow and move toward the back surface 15a side of the first tap groove 9a (chip discharge groove), and are discharged.

Example

[0027] In Example 3 of the present invention shown in FIG. 3, the main difference from Example 2 is that a cutting tap 25 is formed in a form without providing the square portion 6. The tap body 26 is formed by the thread portion 4 and the shank 5. The groove depth can be made deeper than that of the coolant supply groove passing through the center of the side of the square portion, which means that the groove depth can be made shallower, and this means that the strength of the shank can be made stronger. The holder for gripping the shank 5 is preferably a shrink-fit holder in which no gap is generated in the side wall of the gripping portion.

Example

[0028] In Example 4 of the present invention shown in FIG. 4, the main difference from Example 1 is that a cutting tap 30 is formed in which the first coolant introduction groove communicating with the first coolant supply groove 10a is a first coolant introduction groove 29 having a groove width narrower than the groove width of the first coolant supply groove 10a (the groove depth is the same). Compared with other coolant supply grooves, the flow rate of the coolant in the first coolant supply groove 10a can be slowed down and the flow rate can also be reduced.

Example

[0029] In Example 5 of the present invention shown in FIG. 5, the main difference from Example 3 is that a first coolant supply groove for supplying coolant to the first tap groove 9a (chip discharge groove) is a first coolant supply groove 33a (chip discharge groove communication coolant supply groove, small amount coolant supply groove) having a groove width wider than the groove width of the first coolant introduction groove 22a (the groove depth is the same), and a cutting tap 34 is formed. Compared with other coolant supply grooves, the flow rate of the coolant in the first coolant supply groove 33a can be reduced. The first coolant supply groove 33a is a chip discharge groove communication coolant supply groove, a small amount coolant supply groove, and also a differently arranged coolant supply groove (an arrangement form in which the arrangement position in the tap groove is different from other coolant supply grooves).

Example

[0030] In Example 6 of the present invention shown in FIG. 6, the main difference from Example 5 is that a first coolant supply groove for supplying coolant to the first tap groove 9a (chip discharge groove) is a first coolant supply groove 36a (chip discharge groove communication coolant supply groove, small amount coolant supply groove, differently arranged coolant supply groove) having a groove width narrower than the groove width of the first coolant introduction groove 22a, and a cutting tap 37 is formed.

Example

[0031] In Example 7 of the present invention shown in FIG. 7, the main difference from Example 6 is that the first coolant supply groove and the first coolant introduction groove for supplying coolant to the first tap groove 9a (chip discharge groove) are provided at positions closer to the first thread portion 4a side (the back surface 15a side) in the right side view, and a cutting tap 42 is formed with a first coolant supply groove 40a (chip discharge groove communication coolant supply groove, small amount coolant supply groove, differently arranged coolant supply groove) and a first coolant introduction groove 41a. That is, the arrangement position of the first coolant supply groove 40a is a position closer to the back surface 15a side of the first thread portion 4a that cuts first. It is a position away from the rake face 14b of the second thread portion 4b, which is the groove side wall surface that receives the wind pressure accompanying the cutting rotation. Since the first thread portion 40a serves as a wind shield, it reduces the scattering of the coolant due to the wind pressure and delivers a large amount to the tip of the tap.

[0032] It has the following effects. (1) During the rotary cutting operation of the cutting tap 1, in the tap groove portion outside the pilot hole, the air pressure (wind pressure) generated by the rotation directly hits the rake face 14b of the second thread portion 4b following the first thread portion 4a and easily flows out of the tap groove. Therefore, the coolant closer to the rake face 14b is pushed out of the tap groove by the wind pressure and flows out. On the other hand, since the back surface 15a of the leading first thread portion 4a is a place where the wind pressure does not directly act (is not applied), the coolant jetted and supplied from the first coolant supply groove 40a (displaced coolant supply groove) provided at a position closer to the back surface 15a side of the leading first thread portion 4a is not directly hit by the wind pressure generated by the rotation of the tap. Thus, it has the effect of supplying more coolant into the pilot hole and reaching the tip of the tap. (2) According to (1) above, since more coolant can be supplied to the pilot hole, the first coolant supply groove 40a (displaced coolant supply groove) can be formed in a shallower groove shape than other coolant supply grooves. This enables the reduction of the coolant supply amount or the form of slowing down the jet supply flow rate of the coolant, and thus has such an effect. (3) According to (2) above, the displaced coolant supply groove can be made shallower. The formation of a shallow groove can strengthen and toughen the strength of the shank (the thicker the part of the shank without the groove (solid core part) as the groove is shallower), and thus has such an effect.

Example

[0033] In Example 8 of the present invention shown in FIG. 8, the main difference from Example 7 is that a cutting tap 44 is formed in such a position form that the arrangement positions of the second to fourth coolant supply grooves, which are other coolant supply grooves, are closer to the back side of the land in the right side view.

[0034] Specifically, The second coolant supply groove 45b (other coolant supply groove) is in a position form closer to the back surface 15b side of the second thread portion 4b in the right side view. The groove depth is formed at the groove bottom of the second tap groove 9b (chip entry prevention groove) so that the groove penetrates to the tap tip. Also, the second coolant introduction groove 46b is in a form closer to the second thread portion 4b side. The third coolant supply groove 45c (other coolant supply groove) is in a position form closer to the back surface 15c side of the third thread portion 4c in the right side view. The groove depth is formed at the groove bottom of the third tap groove 9c (chip entry prevention groove) so that the groove penetrates to the tap tip. Also, the third coolant introduction groove 46c is in a form closer to the second thread portion 4c side. The fourth coolant supply groove 45d (other coolant supply groove) is in a position form closer to the back surface 15d side of the fourth thread portion 4d in the right side view. The groove depth is formed at the groove bottom of the second tap groove so that the groove penetrates to the tap tip. Also, the fourth coolant introduction groove 46d is in a form closer to the fourth thread portion 4d side in the right side view.

[0035] Each coolant supplied from the second coolant supply groove 45b to the fourth coolant supply groove 45, which are other coolant supply grooves, is in a form closer to the center line 3 than the back side of the preceding thread portion. Therefore, each coolant is not exposed to a direct wind pressure by the preceding thread portion, so the amount of coolant scattered from the tap groove decreases, and thus the amount of coolant reaching the tip of the tap increases. When the amount of coolant reaching the tap tip is large, it is possible to shallower the groove depth of all or part of the other coolant supply grooves (for example, the groove portion in the full thread portion range), which increases the strength of the shank 5.

[0036] The formation positions of the second coolant supply groove 45b, the third coolant supply groove 45c, and the fourth coolant supply groove 45d may be in a form where they are located on the substantially central position line B, or may be in a form where they are formed closer to the rake face.

Embodiment

[0037] In Embodiment 9 of the present invention shown in FIG. 9, the cutting tap 50 has the following configuration. A tapping portion 2 for cutting a female thread in the pilot hole A, a thread portion 4 composed of a full thread portion 3, a shank portion 5, and a square portion 6 provided at the tip of the shank portion 5 (there is also a form without the square portion 6), and a tap body 7 having A first thread portion 4a, a second thread portion 4b, a third thread portion 4c, a fourth thread portion 4d (the number of thread portions may be two, three, five or more). Tap grooves formed between adjacent thread portions 4 (here, a first tap groove 9a (chip discharge groove) is formed between the first thread portion 4a and the second thread portion 4b, a second tap groove 9b (chip entry prevention groove) is formed between the second thread portion 4b and the third thread portion 4c, a third tap groove 9c (chip entry prevention groove) is formed between the third thread portion 4c and the fourth thread portion 4d, and a fourth tap groove 9d (chip entry prevention groove) is formed between the fourth thread portion 4d and the first thread portion 4a). Coolant supply grooves (there are those supplied in liquid form, those supplied in mist form, etc.) provided on the outer periphery of the shank portion 5 and having at least the same number as the number of tap grooves for supplying the coolant from the rear end side of the shank portion 5 to each of all the tap grooves (here, a first coolant supply groove 51a for supplying coolant to the first tap groove 9a (chip discharge groove) is provided, a second coolant supply groove 51b for supplying coolant to the second tap groove 9b (chip entry prevention groove) is provided, a third coolant supply groove 51c for supplying coolant to the third tap groove 9c (chip entry prevention groove) is provided, and a fourth coolant supply groove 21d for supplying coolant to the fourth tap groove 9d (chip entry prevention groove) is provided). A coolant reservoir 11 in the form of a hole is formed at the rear end of the shank portion 5, and coolant introduction grooves are provided to introduce coolant from the coolant reservoir 11 into each of the coolant supply grooves (here, a first coolant introduction groove 52a for supplying the first coolant supply groove 51a is provided, a second coolant introduction groove 52b for supplying the second coolant supply groove 51b is provided, a third coolant introduction groove 52c for supplying the third coolant supply groove 51c is provided, and a fourth coolant introduction groove 52d for supplying the fourth coolant supply groove 51d is provided.). In the right side view, the first coolant supply groove 51a and the first coolant introduction groove 52a are positioned closer to the back surface 15a side of the first threaded portion 4a of the first tap groove 9a (chip discharge groove). In the right side view, the second coolant supply groove 51b and the second coolant introduction groove 52b are positioned closer to the back surface 15b side of the second threaded portion 4b of the second tap groove 9b (chip entry prevention groove). In the right side view, the third coolant supply groove 51c and the third coolant introduction groove 52c are positioned closer to the back surface 15c side of the third threaded portion 4c of the third tap groove 9c (chip entry prevention groove). In the right side view, the fourth coolant supply groove 51d and the fourth coolant introduction groove 52d are positioned closer to the back surface 15d side of the fourth threaded portion 4d of the fourth tap groove 9d (chip entry prevention groove). The cutting tap 50 is configured not to have a through coolant supply hole provided in a through hole form from the rear end side of the shank portion 5 to the tip side of the threaded portion 4 for supplying coolant from the rear end side of the shank 5 and discharging it from the tip side of the threaded portion 4. That is, it is a tap in a form that excludes the through coolant supply hole from the configuration. The form in which a through coolant supply hole (center through hole) provided in a through hole form from the rear end side of the shank portion 5 to the tip side of the threaded portion 4 for supplying coolant from the rear end side of the shank 5 and discharging it from the tip side of the threaded portion 4 is not provided means excluding from this embodiment the form in which a through coolant supply hole (center through hole) provided in a through hole form from the rear end side of the shank portion 5 to the tip side of the threaded portion 4 is provided. The same applies to other embodiments.

[0038] It has the following operating effects. The cutting tap 50 is an optimal tap for use in a through hole or for exclusive use in a through hole. The state of the wind pressure (air flow) generated in the tap groove outside the pilot hole A (in the tap groove that has not yet entered the pilot hole) by the tap operation of cutting and rotating is in a state where the wind pressure hits the rake face, which is the rising face on the cutting edge side, toward the cutting edge side. Therefore, a considerable amount of the coolant in the tap groove that has not entered the pilot hole is pushed out of the tap groove together with the wind per cutting edge face, and in particular, the coolant on the rake face side is pushed out of the tap groove by the wind pressure caused by the cutting rotation of the tap, so that the amount of coolant reaching the tap tip is reduced. Since all the coolant supply grooves of the cutting tap 50 are provided (arranged) at positions closer to the back side of the threaded portion that precedes in the cutting operation, the threaded portion prevents or reduces the influence of the wind pressure caused by the cutting rotation of the tap, so that it has the effect of reducing the scattering outside the tap groove due to the wind pressure and increasing the amount of coolant reaching the tap tip.

[0039] The first coolant supply groove 51a, the second coolant supply groove 51b, the third coolant supply groove 51c, and the fourth coolant supply groove 51d extend in a groove depth form that forms (cuts) a groove at the groove bottom of the tap groove located in the threaded portion 4 through the communicating tap groove, and the groove end point 82 is a position where the coolant flowing through the coolant supply groove is prevented from scattering or its direction is changed so that the coolant hits the engaging portion 2 well by the progress of the coolant being hindered or the progress direction being changed. The position of the groove end 82 (= the length of the coolant supply groove) is at a position of 1 / 3 or more of the threaded portion range groove portion (the tap groove portion within the range of the threaded portion 4), preferably at a position of 1 / 2 or more, more preferably at a position of 2 / 3 or more, and most preferably at a position where the coolant that has reached the groove end 82 and scattered hits well on the gripping portion 2 (a position where it reaches well). It is preferably the length of the coolant supply groove that realizes this.

[0040] The formation positions of the first coolant supply groove 51a, the second coolant supply groove 51b, the third coolant supply groove 51c, and the fourth coolant supply groove 51d may be in a form where they are located on the substantially central position line B, or may be in a form formed closer to the rake face.

Example

[0041] In Example 10 of the present invention shown in FIG. 10, the main difference from Example 9 is that a coolant supply groove for supplying coolant to the first tap groove 9a (chip discharge groove) is not provided (therefore, no coolant introduction groove is provided in the square portion 6), and a cutting tap 55 is formed. The cutting tap 55 is the most suitable tap for use in a blind hole or for exclusive use in a blind hole. In the cutting thread formation of a blind hole, the coolant and chips in the second tap groove 9b (chip entry prevention groove) to the fourth tap groove 9d (chip entry prevention groove) are discharged from the tap tip into the counterbore, flow into the first tap groove 9a (chip discharge groove), rise (move), and are discharged out from the counterbore opening.

Example

[0042] In Example 11 of the present invention shown in FIG. 11, the cutting tap 65 has the following configuration. A tap body 7 having a gripping portion 2 for cutting and forming an internal thread, a threaded portion 4 composed of a complete threaded portion 3, a shank portion 5, and a square portion 6 provided at the tip of the shank portion 5 (there is also a form without the square portion 6), A first threaded portion 4a, a second threaded portion 4b, a third threaded portion 4c, and a fourth threaded portion 4d, A tap groove formed between adjacent thread portions 4 (here, a fifth tap groove 9e (chip entry prevention groove) is formed between the first thread portion 4a and the second thread portion 4b, a second tap groove 9b (chip entry prevention groove) is formed between the second thread portion 4b and the third thread portion 4c, a third tap groove 9c (chip entry prevention groove) is formed between the third thread portion 4c and the fourth thread portion 4d, and a fourth tap groove 9d (chip entry prevention groove) is formed between the fourth thread portion 4d and the first thread portion 4a). Coolant supply grooves (here, a first coolant supply groove 63a communicating with the fifth tap groove 9e (chip entry prevention groove) and supplying coolant to the fifth tap groove 9e (chip entry prevention groove), a second coolant supply groove 63b communicating with the second tap groove 9b (chip entry prevention groove) and supplying coolant to the second tap groove 9b (chip entry prevention groove), a third coolant supply groove 63c communicating with the third tap groove 9c (chip entry prevention groove) and supplying coolant to the third tap groove 9c (chip entry prevention groove), and a fourth coolant supply groove 63d communicating with the fourth tap groove 9d (chip entry prevention groove) and supplying coolant to the fourth tap groove 9d (chip entry prevention groove)) provided on the outer periphery of the shank portion 5 and having at least the same number as the number of tap grooves for supplying coolant (which may be supplied in liquid form, mist form, etc.) from the rear end side of the shank portion 5 to each of all the tap grooves. A hole-shaped coolant reservoir 11 is formed at the rear end of the shank portion 5, and coolant introduction grooves for introducing coolant from the coolant reservoir 11 to each of the coolant supply grooves are provided (here, a first coolant introduction groove 64a for supplying the first coolant supply groove 63a, a second coolant introduction groove 64b for supplying the second coolant supply groove 63b, a third coolant introduction groove 64c for supplying the third coolant supply groove 63c, and a fourth coolant introduction groove 64d for supplying the fourth coolant supply groove 63d). In the right side view, the arrangement positions of the first coolant supply groove 63a and the first coolant introduction groove 64a are set to positions closer to the rake face 14b side of the second thread portion 4b of the fifth tap groove 9e (chip entry prevention groove). In the right side view, the arrangement positions of the second coolant supply groove 63b and the second coolant introduction groove 64b are set to positions closer to the rake face 14c side of the third thread portion 4c of the second tap groove 9b (chip entry prevention groove). In the right side view, the arrangement positions of the third coolant supply groove 63c and the third coolant introduction groove 64c are set to positions closer to the rake face 14c side of the third thread portion 4c of the third tap groove 9c (chip entry prevention groove). In the right side view, the arrangement positions of the fourth coolant supply groove 63d and the fourth coolant introduction groove 64d are in a form where they are closer to the rake face 14a side of the first thread portion 4a in the fourth tap groove 9 (chip entry prevention groove) (however, excluding the form in which a through coolant supply hole (center through hole) is provided in a through hole form from the rear end side of the shank portion 5 to the tip side of the thread portion 4 for supplying coolant from the rear end side of the shank 5 and discharging it from the tip side of the thread portion 4).

[0043] The forms of all the coolant supply grooves including the first coolant supply groove 63a extend in a groove depth form in which grooves are engraved on the groove bottom located in the thread portion 4 through the communicating tap groove, and the groove end point 82 is a position where the coolant flowing through the coolant supply groove is not hindered or its traveling direction is changed, so that the coolant scatters (scatters into the hole formed by the tap groove and the counterbore) and more coolant hits the biting portion 2 (reaches the position). The position of the groove end point 82 (= the length of the coolant supply groove) is a position corresponding to 1 / 3 or more of the thread portion range groove part (the part of the tap groove within the range of the thread portion 4) (= the length of the coolant supply groove), preferably a position corresponding to half or more, more preferably a position corresponding to 2 / 3 or more, and most preferably the length of the coolant supply groove that realizes a position where the coolant that has scattered after reaching the groove end point 82 hits the biting portion 2 well (reaches well).

[0044] The cutting tap 65 is an optimal tap for use in through holes or for exclusive use in through holes. Also, a tap groove without a coolant supply groove may be provided (for example, a fifth tap groove 9e (chip entry prevention groove) may be a tapping tap for blind holes that functions as a dedicated groove for discharging coolant and chips, where the first tap groove 9a (chip discharge groove) without the first coolant supply groove 63a is used).

Embodiment

[0045] In Embodiment 12 of the present invention shown in FIG. 12, the main difference from Embodiment 8 is that the back surface of the first thread portion 4a is the back surface 68a, the back surface of the second thread portion 4b is the back surface 68b, the back surface of the third thread portion 4c is the back surface 68c, the back surface of the fourth thread portion 4d is the back surface 68d, and the shank is the shank 69, and a cutting tap 70 is formed.

[0046] In the right side view, the back surface 68a has an inclination angle substantially the same as the side wall angle of the first coolant supply groove 45a, and is in a substantially continuous state with the side wall of the first coolant supply groove 45a without substantially any step or with a slight step. In the right side view, the back surface 68b has an inclination angle substantially the same as the side wall angle of the second coolant supply groove 45b, and is in a substantially continuous state with the side wall of the second coolant supply groove 45b without substantially any step or with a slight step. In the right side view, the back surface 68c has an inclination angle substantially the same as the side wall angle of the third coolant supply groove 45c, and is in a substantially continuous state with the side wall of the third coolant supply groove 45c without substantially any step or with a slight step. In the right side view, the back surface 68d has an inclination angle substantially the same as the side wall angle of the fourth coolant supply groove 45d, and is in a substantially continuous state with the side wall of the fourth coolant supply groove 45d without substantially any step or with a slight step.

[0047] The shank 69 has a thickness slightly smaller than the hole diameter of the pilot hole A and can be inserted into the pilot hole A (either entirely or partially). The shank may also be in a form with a larger diameter than the hole diameter of the pilot hole A.

Example

[0048] In Example 13 of the present invention shown in FIG. 13, the main difference from Example 12 is that the back surfaces of the threaded portions are the back surfaces 73a to 73d, and the first coolant supply groove 40a, the second coolant supply groove 45b, the third coolant supply groove 45c, and the fourth coolant supply groove 45d are in a connection form with substantially no step on the contact surface at substantially the same inclination angle as the inclination angle (including perpendicular) of the back surfaces 73a to 73d, and a cutting tap 74 is formed. In the right side view, the back surfaces 73a to 73d form a substantially vertical wall surface with the cutting groove located at the upper part. Also, the portions of the second coolant supply groove 45b, the third coolant supply groove 45c, and the fourth coolant supply groove 45d near the back surface are in a stepped form and lead to the tap tip. Also, the first coolant supply groove 40a is in the form of a through groove extending to the tap tip. The second coolant supply groove 45b, the third coolant supply groove 45c, and the fourth coolant supply groove 45d may be in a deep groove form (for example, the groove bottom position is substantially the same as the groove bottom of the tap groove), and the groove may be in the form of a through groove extending to the tap tip, or the groove end point 82 where the groove does not penetrate may be loosened. By adopting such a groove form, it is possible to make a large amount of coolant hit the tap tip (the cutting part) powerfully.

[0049] <Cutting tool> The technical idea of the present invention can also be applied to tools having a plurality of grooves such as a roll tap (upsetting tap), a drill, and a reamer. In particular, it is suitable for a cutting tool that cuttingly expands a pre-formed pilot hole.

Example

[0050] In Example 14 of the present invention shown in FIG. 14, the main difference from Example 9 is that a first coolant supply groove 79a is provided in the first tap groove 9a (chip discharge groove), a second coolant supply groove 79b is provided in the second tap groove 9b (chip entry prevention groove), a third coolant supply groove 79c is provided in the third tap groove 9c (chip entry prevention groove), and a fourth coolant supply groove 79d is provided in the fourth tap groove 9c to form a cutting tap 80. (A) The second coolant supply groove 79b, the third coolant supply groove 79c, and the fourth coolant supply groove 79d are formed near the back walls of the back surfaces 15b, 15c, and 15d, and a part or all of them cuts into the curved walls of the back surfaces 15b, 15c, and 15d. They have a groove width that is substantially the same, and the groove depth is such that the groove bottom position is substantially the same as the tap groove and the groove bottom position. The groove form is such that the groove direction is formed substantially in the same direction as the central position line B. Since the second coolant supply groove 79b, the third coolant supply groove 79c, and the fourth coolant supply groove 79d are in a form where a part or all of them cut into the curved walls of the back surfaces 15b, 15c, and 15d, a coolant supply groove is formed at the tip of the tap where the back wall continues and penetrates forward. Since the coolant supply amount is large and the flow rate is fast, the chips cannot rise in the tap groove and are discharged toward the tip of the tap (such three tap grooves do not function as chip discharge grooves for discharging chips from the opening of the counterbore). Therefore, the coolant supplied to the second coolant supply groove 79b, the third coolant supply groove 79c, and the fourth coolant supply groove 79d reaches the tip of the tap through the second coolant supply groove 79b, the third coolant supply groove 79c, and the fourth coolant supply groove 79d, so that the amount of coolant discharged to the tip side increases and the coolant has momentum. (B) The first coolant supply groove 79a is in a shallow groove form with a groove depth shallower than that of the second coolant supply groove 79b and a narrow groove form with a narrow groove width. The formation position is near the rake face 14b. Since the coolant supply amount is smaller than the coolant supply amounts of the second coolant supply groove 79b, the third coolant supply groove 79c, and the fourth coolant supply groove 79d and the flow path position is shallow, in the screw formation of the stop hole, the combined coolant of the second coolant supply groove 79b, the third coolant supply groove 79c, and the fourth coolant supply groove 79d, which is stronger than the coolant flow rate and momentum, does not take the coolant in the first coolant supply groove 79a and entraps all the chips, causing them to rise in the first tap groove 9a (chip discharge groove) and be discharged from the bottom hole. The first tap groove 9a (chip discharge groove) functions as a discharge groove, and the cooling of the cutting edge 13b etc. in the first tap groove 9a (chip discharge groove) is performed by the combined coolant of the second coolant supply groove 79b, the third coolant supply groove 79c, and the fourth coolant supply groove 79d. Therefore, the coolant in the first coolant supply groove 79a does not reach the cutting edge and does not function as coolant. And since the first coolant supply groove 79a is provided at a position close to the rake face 14b, there is almost no coolant injection or only a weak influence on the back surface 15a side, which is the opposite side. Thus, the combined coolant of the second coolant supply groove 79b, the third coolant supply groove 79c, and the fourth coolant supply groove 79d smoothly rises on the back surface 15a side and is discharged. (c) When the bottom hole is a through hole, the coolant in the first coolant supply groove 79a reaches the tap tip and cools the cutting edge 13b etc., and the coolants in the second coolant supply groove 79b, the third coolant supply groove 79c, and the fourth coolant supply groove 79d also cool their respective cutting edges etc.

[0051] This is the case in the progress of the cutting operation for some time from the start of screw formation in the bottom hole as follows. In a conventional form (for example, the invention of Patent Document 1) in which a coolant supply groove is provided on the axis, for some time from the start of cutting the pilot hole, much of the coolant scatters into the space, resulting in a small supply amount and weak force of the coolant to the biting portion, and the biting portion cannot be sufficiently cooled for some time from the start of cutting the pilot hole. Since the force to push out the chips to the front of the tap cannot be obtained sufficiently, the risk of chips remaining in the tap groove increases, and the risks such as chips being bitten in and clogging of chip masses increase. On the other hand, the cutting tap 80 realizes a form in which the coolant reaches the biting portion 2 with an appropriate amount and force from the start of thread formation of the pilot hole in the long groove-shaped second coolant supply groove 79b, third coolant supply groove 79c, and fourth coolant supply groove 79d, so that the biting portion can be sufficiently cooled from the start of cutting the pilot hole, and the generated chips can be surely pushed out to the pilot hole space in front of the tap.

[0052] The second coolant supply groove 79b, the third coolant supply groove 79c, and the fourth coolant supply groove 79d may be provided near the rake face 14c, rake face 14d, and rake face 14a. Also, a form in which the second coolant supply groove 79b, the third coolant supply groove 79c, and the fourth coolant supply groove 79d are provided on the curved inclined surfaces (rake faces) of the rake face 14c, rake face 14d, and rake face 14a is also good, and a coolant supply groove with a deeper groove depth can be realized.

Example

[0053] In Example 15 of the present invention shown in FIG. 15, the main difference from Example 14 is that the second coolant supply groove, the third coolant supply groove, and the fourth coolant supply groove are formed as non-through groove forms (here, the groove end 82 is set at a position slightly closer to the tap tip than the shank portion 5 reaching the biting portion 2) that do not penetrate the tap tip and extend to a position close to the tap tip, and a cutting tap 83 is formed. The coolant that has flowed through the second coolant supply groove 81b, the third coolant supply groove 81c, and the fourth coolant supply groove 81d hits or is redirected along the groove end wall, which is the wall of the groove end point 82, and scatters into the hole formed by the counterbore and the tap groove, achieving the effect of efficiently cooling the cutting edge of the engaging portion 1 and the counterbore wall during cutting. The groove end wall of the groove end point 82 has a gentle curved surface form, an inclined surface form, a steep inclined surface form, a vertical wall, etc. The optimal position of the groove end point 82 changes depending on the form of the groove end wall, but it is preferable that most of the scattered coolant hits (reaches well) the engaging portion 2.

[0054] In Fig. 15, a comparison is made between the second coolant supply groove 10b provided on the central position line B (axial center line) (the groove bottom is at the same position as the groove bottom of the second tap groove 9b (chip entry prevention groove)), the second coolant supply groove 81b, the third coolant supply groove 81c, and the fourth coolant supply groove 81d. The coolant in the second coolant supply groove 10b scatters in front of the threaded portion 4, but in the second coolant supply groove 81b, the third coolant supply groove 81c, and the fourth coolant supply groove 81d, the coolant scatters at a position near the engaging portion 2 of the threaded portion 4 and within the hole formed by the tap groove and the counterbore, so that the coolant scatters from the start to the end of cutting at a position where the scattered coolant hits (reaches well) the engaging portion 2.

[0055] This means that at the start of threading the counterbore and during subsequent cutting operations, in the second coolant supply groove 10b, most of the coolant scatters into the space, resulting in less supply to the engaging portion 2 and a weak force. In contrast, the cutting tap 83 realizes a form (a form that reaches well) in which an appropriate amount of coolant surely hits the engaging portion 2 with force in the second coolant supply groove 81b, the third coolant supply groove 81c, and the fourth coolant supply groove 81d having a long groove form (a form in which the groove end point 82 is located near the engaging portion). As a result, the cutting tap 83 realizes a form (a form in which it reaches well) in which coolant with an appropriate amount and momentum hits the biting portion 2 well from the start of the tapping of the pilot hole to the completion of the tapping in the long and extended groove-shaped second coolant supply groove 81b, third coolant supply groove 81c, and fourth coolant supply groove 81d. Therefore, the biting portion can be well cooled from the start of the cutting of the pilot hole, and it is realized that the chips generated from the start of the cutting are surely pushed out into the pilot hole space ahead of the tap.

[0056] The second coolant supply groove 81b, the third coolant supply groove 81c, and the fourth coolant supply groove 81d may be formed closer to the rake surfaces 14c, 14d, and 14a. Further, the second coolant supply groove 81b, the third coolant supply groove 81c, and the fourth coolant supply groove 81d may be formed on the inclined surfaces (rake surfaces) of the rake surfaces 14c, 14d, and 14a, and a coolant supply groove with a deeper groove depth can be realized.

Example

[0057] In Example 16 of the present invention shown in FIGS. 16 and 17, the main difference from Example 7 is that In the use of a blind hole, the third tap groove 9c (chip entry prevention groove) is formed as a seventh tap groove 9g (chip discharge groove) in a form in which chips and coolant are discharged out of the opening of the pilot hole A, a shallow groove-shaped first coolant supply groove 84a that supplies a small amount of coolant in a thin injection form is provided near the back surface 15a in the shank 5 in communication with the first tap groove 9a (chip discharge groove), a shallow groove-shaped sixth coolant supply groove 84g that supplies a small amount of coolant in a thin injection form is provided near the back surface 15c in the shank 5 in communication with the seventh tap groove 9g (chip discharge groove), The second tap groove 9b (chip entry prevention groove) and the fourth tap groove 9d (chip entry prevention groove) are configured to function as chip extrusion grooves (not functioning as chip discharge grooves) into which a larger amount of coolant is supplied than the coolant supply amounts of the first coolant supply groove 84a and the sixth coolant supply groove 84g, and the chips are pushed out (discharged) into the under-hole space on the tap tip side. The second tap groove 9b (chip entry prevention groove) includes a second shallow tap groove portion 9b1 that is a shallow groove extending from the shank 5 side toward the tap tip, and a second deep tap groove portion 9b2 that is located on the tap tip side of the second shallow tap groove portion 9b1 and extends toward the tap tip, and has a groove shape deeper than that of the second shallow tap groove portion 9b1 (the groove bottom is closer to the axis than the groove bottom of the second shallow tap groove portion 9b1). The fourth tap groove 9d (chip entry prevention groove) includes a fourth shallow tap groove portion 9d1 that is a shallow groove extending from the shank 5 side toward the tap tip, and a fourth deep tap groove portion 9d2 that is located on the tap tip side of the fourth shallow tap groove portion 9d1 and extends toward the tap tip, and has a groove shape deeper than that of the fourth shallow tap groove portion 9d1 (the groove bottom is closer to the axis than the groove bottom of the fourth shallow tap groove portion 9d1). A second coolant supply groove 84b is provided that passes through the second shallow tap groove portion 9b1 from the shank 5 and leads to the second deep tap groove portion 9b2. A fourth coolant supply groove 84d is provided that passes through the fourth shallow tap groove portion 9d1 from the shank 5 and leads to the fourth deep tap groove portion 9d2. The second coolant supply groove 84b consists of a first groove portion 84b1 passing through the shank portion 5 and a second groove portion 84d2 passing through the second shallow tap groove portion 9b1 (the groove bottoms of the first groove portion 84b1 and the second groove portion 84d2 are in a straight connection form with substantially no step). The fourth coolant supply groove 84d consists of a first groove portion 84d1 passing through the shank portion 5 and a fourth groove portion 84d2 passing through the fourth shallow tap groove portion 9d1 (the groove bottoms of the first groove portion 84d1 and the second groove portion 84d2 are in a straight connection form with substantially no step). The coolant passing through the second coolant supply groove 84b partially scatters and discharges at the end position of the first groove part 84b1, and the coolant flowing along the groove bottom flows through the second groove part 84b2 and is discharged into the second deep tapping groove part 9b2 and scatters to hit the biting part 2, realizing a form in which efficient cooling and the like are performed. The coolant passing through the fourth coolant supply groove 84d partially scatters and discharges at the end position of the first groove part 84d1, and the coolant flowing along the groove bottom flows through the second groove part 84d2 and is discharged into the fourth deep tapping groove part 9d2 and scatters to hit the biting part 2, realizing a form in which efficient cooling and the like are performed. The cutting tap 87 is formed in this form.

[0058] The heights of the second shallow tapping groove part 9b1 and the fourth shallow tapping groove part 9d1 only need to be such that the formed internal threads do not come into contact, and it is preferable to make them as high as possible. The tips of the second shallow tapping groove part 9b1 and the fourth shallow tapping groove part 9d1 should not reach the position of the biting part 2, and it is preferable to have a length that fits within the range of the full thread part 3 (the groove part within the full thread part range). The second shallow tapping groove part 9b1 and the fourth shallow tapping groove part 9d1 do not affect the curling of the chips. It is the second deep tapping groove part 9b2 and the fourth deep tapping groove part 9d2 that affect the curling of the chips. The coolants in the second coolant supply groove 84b and the fourth coolant supply groove 84d flow into the first tapping groove 9a (chip discharge groove) and the seventh tapping groove 9g (chip discharge groove) depending on their momentum and coolant volume, and do not regard the coolants in the first coolant supply groove 84a and the sixth coolant supply groove 84g (the coolant supply form in which the coolant volume is small and the momentum is weak and the coolant is supplied outward in the tapping groove direction). While entraining the chips, they rise in the tapping groove to realize discharge from the bottom hole opening to the outside. When it is a tap dedicated to forming a blind hole thread, it is also possible not to provide the first coolant supply groove 84a and the sixth coolant supply groove 84g.

[0059] Since the second shallow tap groove portion 9b1 and the fourth shallow tap groove portion 9d1 thicken the threaded portion 4, a tap with increased torsional strength and difficulty in breaking is realized. In addition, the groove depths and groove widths of the second coolant supply groove 84b and the fourth coolant supply groove 84d have various forms, and by making the groove depth shallower, the torsional strength of the tap is enhanced.

Example

[0060] In Example 17 of the present invention shown in FIG. 18, the main differences from Example 16 are as follows: The groove width of the second tap groove 9b (chip entry prevention groove) is narrowed, The groove width of the fourth tap groove 9d (chip entry prevention groove) is narrowed, The groove width of the first tap groove 9a (chip discharge groove) is widened, The groove width of the seventh tap groove 9g (chip discharge groove) is widened, The arrangement position of the first coolant supply groove 84a is on the central position line B, The arrangement position of the sixth coolant supply groove 84g is on the central position line B, By narrowing the groove width, the curl of the chips formed by the cutting operation of the second tap groove 9b (chip entry prevention groove) and the fourth tap groove 9d (chip entry prevention groove) is reduced, and the chip breakage is accelerated so that the chip length is shortened. Also, the first tap groove 9a (chip discharge groove) and the seventh tap groove 9g (chip discharge groove) with widened groove widths enable the chips to be discharged quickly, forming a cutting tap 89.

Example

[0061] In Example 18 of the present invention shown in FIG. 19, the main differences from Example 17 are as follows: The form of the second coolant supply groove 84b is such that the groove is also formed at the bottom of the second tap groove 9b (chip entry prevention groove) and has a non - penetrating groove form. The groove end point 82, which is the end point of the groove, is formed at a position that does not reach the sticking portion. The groove end point 82 has a vertical wall form or an inclined wall form and functions to direct the injection direction or scattering direction of the coolant more towards the sticking portion by the sticking portion. The form of the fourth coolant supply groove 84d is such that the groove is also formed at the bottom of the fourth tap groove 9d (chip entry prevention groove) and has a non-penetrating groove form, and the groove end point 82, which is the end point of the groove, is formed at a position that does not reach the adhering part. The groove end point 82 has a vertical wall form or an inclined wall form and functions to direct the injection direction or scattering direction of the coolant more towards the adhering part by the adhering part. The arrangement position of the first coolant supply groove 84a is closer to the scraping surface 14b. The cutting tap 90 is formed such that the arrangement position of the third coolant supply groove 84c is further from the scraping surface 14d.

Example

[0062] In Example 19 of the present invention shown in Fig. 20, the cutting tap 92 In the second tap groove 9b (chip entry prevention groove), a raised portion 94b is formed in a form that rises from the groove bottom of the second tap groove 9b (chip entry prevention groove), contacts the shank portion 5 on the side closer to the scraping surface 14c, and is accommodated within the range of the complete thread portion 3 (complete thread portion range groove part) towards the tap tip side (axial direction). In the fourth tap groove 9d (chip entry prevention groove), a raised portion 94d is formed in a form that rises from the groove bottom of the fourth tap groove 9d (chip entry prevention groove), contacts the shank portion 5 on the side closer to the scraping surface 14a, and is accommodated within the range of the complete thread portion 3 (complete thread portion range groove part) towards the tap tip side. The second coolant supply groove 95b, with the groove bottom position being substantially the same as the groove bottom of the second tap groove 9b (chip entry prevention groove), is provided in a form that passes through the shank 5 and through the raised portion 94b. The fourth coolant supply groove 95d, with the groove bottom position being substantially the same as the groove bottom position of the fourth tap groove 9d (chip entry prevention groove), is provided in a form that passes through the shank 5 and through the raised portion 94d. On the shank 5, the first coolant supply groove 84a, which has a shallower groove depth than the groove depth of the second coolant supply groove 95b, is provided closer to the back surface 15a and injects and supplies coolant into the first tap groove 9a (chip discharge groove). On the shank 5, a sixth coolant supply groove 84g having a groove depth shallower than that of the second coolant supply groove 95b is provided near the back surface 15c in a form of jet-supplying coolant into the seventh tap groove 9g. The raised portions 94b and 94d do not affect the curling of the chips. What affects the curling of the chips is approximately the range of the engaging portion 2 at the tip of the second tap groove 9b (chip entry prevention groove) and the fourth tap groove 9d (chip entry prevention groove).

[0063] The height of the raised portions 94b and 94d only needs to be such that the formed internal threads do not come into contact, and it is preferably as high as possible. The tips of the raised portions 94b and 94d shall not reach the position of the engaging portion 2, and it is preferable that the length is within the range of the complete thread portion 3 (complete thread portion range groove part). The length of the raised portion 94b, the length of the raised portion 94d, the groove end point 82 (= groove length) of the second coolant supply groove 95b, and the groove end point 82 of the fourth coolant supply groove 95d shall be such that the coolant reaching and scattered from the groove end point 82 hits the engaging portion 2 well (reaches well), and the position of the groove end point 82 shall be at a position of 1 / 3 or more, preferably half or more, more preferably 2 / 3 or more of the thread portion range groove part (the part of the tap groove within the range of the thread portion 4).

[0064] Since the raised portions 94b and 94d thicken the thread portion 4, a tap with increased torsional strength and less likely to break is realized.

[0065] It is also preferable to provide the raised portion 94b and the second coolant supply groove 95b near the back surface 15b, and the raised portion 94d and the fourth coolant supply groove 95d near the back surface 15d.

Example

[0066] In Example 20 of the present invention shown in Fig. 21, the cutting tap 97 is In the second tap groove 9b (chip entry prevention groove), a raised portion 98b is formed in a form that rises from the groove bottom of the second tap groove 9b (chip entry prevention groove) in the form of a raised partition wall, communicates with the shank portion 5, and is within the range of the complete thread portion 3 (complete thread portion range groove portion) toward the tap tip side. In the fourth tap groove 9d (chip entry prevention groove), a raised portion 98d is formed in a form that rises from the groove bottom of the fourth tap groove 9d (chip entry prevention groove) in the form of a raised partition wall, communicates with the shank portion 5, and is within the range of the complete thread portion 3 (complete thread portion range groove portion) toward the tap tip side. A second coolant supply groove 99b having a groove bottom position substantially the same as the groove bottom position of the second tap groove 9b (chip entry prevention groove) is provided in a form that passes through the shank 5 and passes through the raised portion 98b. A fourth coolant supply groove 99d having a groove bottom position substantially the same as the groove bottom position of the fourth tap groove 9d (chip entry prevention groove) is provided in a form that passes through the shank 5 and passes through the raised portion 98d. On the shank 5, a first coolant supply groove 84a having a groove depth shallower than that of the second coolant supply groove 99b is provided near the back surface 15a, and coolant is jet-supplied into the first tap groove 9a (chip discharge groove). On the shank 5, a sixth coolant supply groove 84g having a groove depth shallower than that of the second coolant supply groove 99b is provided near the back surface 15c, and coolant is jet-supplied into the seventh tap groove 9g.

[0067] The raised portions 98b and 98d do not affect the curling of the chips. What affects the curling of the chips is substantially the range of the biting portion 2 ahead of the second tap groove 9b (chip entry prevention groove) and the fourth tap groove 9d (chip entry prevention groove). Since the raised portions 98b and 98d thicken the thread portion 4, a tap with increased torsional strength and less likely to break is realized.

[0068] The height of the raised portions 98b and 98d only needs to be such that the formed internal threads do not contact, and it is preferably as high as possible. The tips of the raised portions 98b and 98d shall not reach the position of the engaging portion 2, and shall have a length that fits within the range of the complete thread portion 3 (the groove portion of the complete thread portion range). The length of the raised portion 98b, the length of the raised portion 98d, the groove end point 82 (= groove length) of the second coolant supply groove 99b, and the groove end point 82 (= groove length) of the fourth coolant supply groove 99d shall be such that the position where the coolant that reaches the groove end point 82 and scatters hits well against the engaging portion 2 (a position where it reaches well) is realized. The position of the groove end point 82 shall be at a position corresponding to 1 / 3 or more of the thread portion range groove portion (the portion of the tap groove within the range of the thread portion 4), preferably at a position of 1 / 2 or more, and more preferably at a position of 2 / 3 or more. The groove depths and groove widths of the second coolant supply groove 99b and the fourth coolant supply groove 99d have various forms. If the groove depth is shallower, the torsional strength is enhanced accordingly. In a form where no coolant supply grooves are provided in the raised portions 98b and 98d, and grooves (hereinafter also referred to as "left groove" and "right groove") are formed on the left and right sides with the raised portions 98b and 98d as partition walls, a form of providing a coolant supply groove in which coolant is supplied to the left groove and the right groove or either one of the grooves is also good.

Example

[0069] In Example 21 of the present invention shown in Fig. 22, the main difference from Example 20 is The groove of the second coolant supply groove 99b is formed (cut) to the groove bottom of the second tap groove 9b (chip entry prevention groove), and the groove end point 82 is set to a position passing beyond the raised portion 98b. The groove end point 82 has a vertical wall or inclined wall form. Therefore, the coolant hitting the groove end point 82 is in a scattered state where the direction changes and hits well against the engaging portion. The groove of the fourth coolant supply groove 99d is formed (engraved) up to the groove bottom of the fourth tap groove 9d (chip entry prevention groove), and the groove end point 82 is set at a position passing over the raised portion 98d. The groove end point 82 is in the form of a vertical wall or an inclined wall. Therefore, the coolant hitting the groove end point 82 is in a scattered state where the direction changes and hits well against the biting portion, which is the point where the cutting tap 100 is formed.

Example

[0070] In Example 22 of the present invention shown in FIG. 23, the cutting tap 102 has the following configuration. At a height that does not contact the female thread formed in the pilot hole A, at a length up to the front of the biting portion 2 (a length that does not interfere with the cutting operation of the biting portion and chip formation), or in a form that fits within the range of the complete thread portion (within the complete thread portion groove area) toward the tap tip side in communication with the shank portion, a partition wall 103b is formed at approximately the center of the second tap groove 9b (chip entry prevention groove). The partition wall 103b divides the second tap groove 9b (chip entry prevention groove) into two grooves, and a back surface side groove 104b and a cutting surface side groove 105b are formed. At a height that does not contact the female thread formed in the pilot hole A, at a length up to the front of the biting portion 2 (a length that does not interfere with the cutting operation of the biting portion and chip formation), or in a form that fits within the range of the complete thread portion (complete thread portion groove area) toward the tap tip side in communication with the shank portion, a partition wall 103d is formed at approximately the center of the fourth tap groove 9d (chip entry prevention groove). The partition wall 103d divides the fourth tap groove 9d (chip entry prevention groove) into two grooves, and a back surface side groove 104d and a cutting surface side groove 105d are formed. A second coolant supply groove 99b having a groove bottom at approximately the same position as the groove bottom of the second tap groove 9b (chip entry prevention groove) is provided in a form that communicates with the cutting surface side groove 105b through the shank 5. The coolant flowing through the second coolant supply groove 99b is jetted into the cutting surface side groove 105b having a narrow groove form, and flows through the cutting surface side groove 105b to reach the biting portion 2. A fourth coolant supply groove 99d having a groove bottom substantially at the same position as the groove bottom of the fourth tap groove 9d (chip entry prevention groove) is provided in a form communicating with the cutting surface side groove 105d through the shank 5, and the coolant flowing through the fourth coolant supply groove 99d is injected into the cutting surface side groove 105d having a narrow groove form, and is configured to flow through the cutting surface side groove 105d and reach the biting portion 2.

[0071] The partition walls 103b and 103d do not affect the curling of the chips. What affects the curling of the chips is substantially the range of the biting portion 2 at the tip of the second tap groove 9b (chip entry prevention groove) and the fourth tap groove 9d (chip entry prevention groove). The tips of the partition walls 103b and 103d should be in a form that does not reach the position of the biting portion 2 and should have a length that fits within the range of the complete thread portion 3 (complete thread portion groove part). Since the coolant is guided to the cutting surface side grooves 105b and 105d having a groove width of approximately half or less of the groove width of the tap groove, the amount of coolant reaching the biting portion 2 increases. The coolant supply groove may also be provided in the back surface side grooves 104b and 104d.

Embodiment

[0072] In Embodiment 23 of the present invention shown in FIG. 24, the main difference from Embodiment 16 is The forms of the second shallow tap groove portion 9b1 and the fourth shallow tap groove portion 9d1 are in the form of inclined surfaces that slope substantially straight downward from the shank side toward the tap tip side. The groove forms of the second coolant supply groove 84b and the fourth coolant supply groove 84d are in the form of grooves formed at the groove bottoms of the second tap groove 9b (chip entry prevention groove) and the fourth tap groove 9d (chip entry prevention groove), and the groove end points are the groove end points 82 formed by walls (vertical walls or inclined walls) that change or scatter the direction of the coolant. This is the point where the cutting tap 106 is formed. Each groove end point 82 is in a position form that passes through the inclined surface end points 107 of the second shallow tap groove portion 9b1 and the fourth shallow tap groove portion 9d1. The second shallow tap groove portion 9b1 and the fourth shallow tap groove portion 9d1 do not affect the curling of the chips. It is the second deep tap groove portion 9b2 and the fourth deep tap groove portion 9b2 that affect the curling of the chips.

[0073] Since the second shallow tap groove portion 9b1 and the fourth shallow tap groove portion 9d1 increase the wall thickness of the threaded portion 4, a tap with increased torsional strength and being difficult to break is realized.

Embodiment

[0074] In Embodiment 24 of the present invention shown in FIG. 25, the main difference from Embodiment 1 is that the second coolant supply groove 10b, the third coolant supply groove 10c, and the fourth coolant supply groove 10d are extended to a groove length of approximately two-thirds of the threaded portion range groove portion, and grooves are formed (grooved) in the tap groove, with the groove end point being the groove end point 82. The coolant reaching the groove end point 82 hits the wall of the groove end point 8 or is redirected and scattered so as to hit the biting portion 2 well, and a cutting tap 109 is formed.

[0075] The groove bottoms of the second tap groove 9b (chip entry prevention groove), the third tap groove 9c (chip entry prevention groove), and the second tap groove 9d are in a substantially planar form, and the groove bottoms of the second coolant supply groove 10b, the third coolant supply groove 10c, and the fourth coolant supply groove 10d are in a substantially planar form. By this form, the groove depth and the groove cross-sectional area are increased to increase the flow rate of the coolant volume. The amount of coolant supplied by the first coolant supply groove 10a to the first tap groove 9a (chip discharge groove) is less than the amount of coolant jetted from the second coolant supply groove 10b to the fourth coolant supply groove 10d into the tap groove and jets at a position away from the outside of the tap groove. At the time of forming the stop hole, the combined coolant incorporating the chips of the second coolant supply groove 10b to the fourth coolant supply groove 10d pushes aside the coolant in the first coolant supply groove 10a or changes the flow direction to the side with less influence of the coolant in the chip discharge groove communication coolant supply groove and rises in the first tap groove 9a (chip discharge groove) and is discharged out from the opening of the counterbore. Therefore, in the stop hole machining, the first tap groove 9a (chip discharge groove) functions as a dedicated discharge groove. Also, in the machining of the through hole, the coolant supplied from the first coolant supply groove 10a to the first tap groove 9a (chip discharge groove) flows through the first tap groove 9a (chip discharge groove), reaches the biting portion 2, and cools the tap tip.

[0076] It is also possible to use a dedicated tap for stop holes by making the groove form of the first tap groove 9a (chip discharge groove) the same as the groove form of the second tap groove 9b (chip entry prevention groove) and making the groove form of the first coolant supply groove 10a the same as the form of the second coolant supply groove 10b.

Embodiment

[0077] In the 25th embodiment of the present invention shown in Fig. 26, the main difference from the 16th embodiment is The tap grooves are provided in six locations: the first tap groove 9a (chip discharge groove) to the sixth tap groove 9f (chip entry prevention groove), The groove widths of the second tap groove 9b (chip entry prevention groove) to the sixth tap groove 9f (chip entry prevention groove) are in a groove width form narrower than the groove width of the first tap groove 9a (chip discharge groove), The lands are provided in six locations: the first thread portion 4a to the sixth thread portion 4f, The land widths of the first thread portion 4a to the sixth thread portion 4f in this 25th embodiment are in a land width form narrower than the land widths of the first thread portion 4a to the fourth thread portion 4d in the 16th embodiment, In the second tap groove 9b (chip entry prevention groove) to the sixth tap groove 9f (chip entry prevention groove) in this Example 25, second shallow tap groove portions 9b1 to 9f1 are provided. The groove depths of the second shallow tap groove portions 9b1 to 9f1 in this Example 25 are shallower than the groove depths of the second shallow tap groove portion 9b1 and the fourth shallow tap groove portion 9d1 in the above Example 16, and this is the point where the cutting tap 111 is formed.

[0078] For example, the cutting tap 87 in Example 16 has four thread portions. In the form where the number of cutting edges at the engaging portion of one thread portion is three, the total number of cutting edges is 3 cutting edges × 4 thread portions = 12 cutting edges. On the other hand, for the cutting tap 111 with six thread portions when the number of cutting edges at the engaging portion is three, the total number of cutting edges is 3 cutting edges × 6 thread portions = 18 cutting edges. That is, since the cutting amount (cutting thickness) of one cutting edge of the cutting tap 111 is less than that of one cutting edge of the cutting tap 87, the durability of the cutting edges of the cutting tap 111 is improved and the chips become thinner, so that the formation of a high-precision internal thread is realized. Also, the chips are thinly and curled and cut small in the second deep tap groove portions 9b2 to 9f2 with a narrow groove width, are discharged into the under-hole space at the tip of the tap, flow into the first tap groove 9a (chip discharge groove), and are discharged outside. In the thread formation of the counterbore, the second tap groove 9b (chip entry prevention groove) to the sixth tap groove 9f (chip entry prevention groove) are tap grooves that function as chip entry prevention grooves that do not discharge chips.

[0079] The height of the second shallow tap groove portions 9b1 to 9f1 only needs to be a height at which the formed internal thread does not come into contact, and it is preferably as high as possible. The coolant for the second to sixth shallow tap groove portions 9b1 to 9f1 (chip entry prevention grooves) flows into the first tap groove 9a (chip discharge groove) depending on its momentum and coolant volume, and does not take into account the coolant in the first coolant supply groove 84a (a coolant supply form in which the coolant volume is small and the momentum is weak, and the coolant is supplied outward in the tap groove direction). While entraining chips, it rises in the tap groove to achieve discharge from the bottom hole opening. In the case of a tap dedicated to forming a blind hole thread, it is also possible not to provide the first coolant supply groove 84a and the third coolant supply groove 84c. Also, the number of threads in the threaded portion is preferably 5 or more, preferably 6 or more.

Example

[0080] In Example 26 of the present invention shown in FIG. 27, the main difference from Example 25 is The groove depths of the second to sixth deep tap groove portions 9b2 to 9f2 (chip entry prevention grooves) are made shallow, and a cutting tap 113 with increased torsional strength is formed.

[0081] The taps in the above-described examples are cutting taps with cutting edges, but they can also be applied to raising taps that form female threads by plastic processing without cutting edges. As a concept, in the form of the cutting tap in the example, the form of the raising tap is realized by making the form of each thread crest in the threaded portion into a thread crest without a cutting edge (rolled thread crest, raised thread crest, roll thread crest).

[0082] [Supplementary Invention] [Supplementary Invention 1] Partially Chip Discharge Groove Connecting Coolant Supply Groove A tap body having a threaded portion for forming a female thread and a shank portion, A tap groove formed between adjacent threaded portions, At least the same number of coolant supply grooves as the number of the tap grooves provided on the outer periphery of the shank portion for supplying coolant from the rear end side of the shank portion to each of all the tap grooves. At least one of the coolant supply grooves is a chip discharge groove connecting coolant supply groove having a groove width different from that of the other coolant supply grooves, a groove depth different from that of the other coolant supply grooves, or both a different groove width and a different groove depth. The groove cross-sectional area of the chip discharge groove connecting coolant supply groove is smaller than the groove cross-sectional area of the other coolant supply grooves (however, excluding the form in which a through coolant supply hole provided in a through-hole form from the rear end side of the shank portion to the tip side of the thread portion is provided for supplying coolant from the rear end side of the shank and discharging it from the tip side of the thread portion), and it is a tap. [Supplementary Invention 2] Partially Chip Discharge Groove Connecting Coolant Supply Groove A tap body having a thread portion forming a female thread and a shank portion, A tap groove formed between adjacent thread portions, Coolant supply grooves provided on the outer periphery of the shank portion, the number of which is at least the same as the number of the tap grooves, for supplying coolant from the rear end side of the shank portion to each of all the tap grooves. At least one of the coolant supply grooves is a chip discharge groove connecting coolant supply groove having a groove depth shallower than the groove depth of the other coolant supply grooves (however, excluding the form in which a through coolant supply hole provided in a through-hole form from the rear end side of the shank portion to the tip side of the thread portion is provided for supplying coolant from the rear end side of the shank and discharging it from the tip side of the thread portion), and it is a tap. [Supplementary Invention 3] Partially Small Amount Coolant Supply Groove A tap body having a thread portion forming a female thread and a shank portion, A tap groove formed between adjacent thread portions, Coolant supply grooves provided on the outer periphery of the shank portion, the number of which is at least the same as the number of the tap grooves, for supplying coolant from the rear end side of the shank portion to each of all the tap grooves. At least one of the coolant supply grooves is a small coolant supply groove in which the injection supply amount of the coolant is smaller than that of the other coolant supply grooves (however, except for the form in which a through coolant supply hole provided in a through hole form from the rear end side of the shank portion to the tip side of the threaded portion is provided for supplying the coolant from the rear end side of the shank and discharging it from the tip side of the threaded portion), and it is a tap. [Supplementary Invention 4] Partial small coolant supply groove At the rear end of the shank portion, a coolant introduction groove for introducing coolant into each of the coolant supply grooves is provided. The groove cross-sectional area of the introduction groove of the small coolant supply groove is smaller than that of the introduction groove of the other coolant supply grooves, and it is the tap described in the above Supplementary Invention 3. [Supplementary Invention 5] Partial coolant supply groove with different arrangement near the threaded portion A tap body having a threaded portion for forming an internal thread and a shank portion. A tap groove formed between adjacent threaded portions. On the outer periphery of the shank portion, there are provided at least the same number of coolant supply grooves as the number of the tap grooves for supplying coolant from the rear end side of the shank portion to each of all the tap grooves. At least one of the coolant supply grooves is a coolant supply groove with a different arrangement position closer to the threaded portion side than the central position line (B) of the tap groove, and the arrangement positions of the other coolant supply grooves are provided on the substantially central position line (B) of the tap groove (however, except for the form in which a through coolant supply hole provided in a through hole form from the rear end side of the shank to the tip side of the threaded portion is provided for supplying the coolant from the rear end side of the shank and discharging it from the tip side of the threaded portion), and it is a tap. The "central position line (B) of the tap groove" means that any form in which the coolant supply groove reaches the tap groove, the form in which the coolant supply groove does not reach the tap groove, and the form in which the coolant is jet-supplied to the tap groove is included in the technical scope. The same applies to the following supplementary inventions. Also, the "central position line (B) of the tap groove" is an axis extending from the tip side of the tap to the rear end side of the shank. In the form where the tap groove is curved, it is a line extending the axis of the shank from the central position of the rear end portion of the tap groove to the rear end side. This also applies to the following supplementary inventions. [Supplementary Invention 6] Coolant supply groove with different arrangement near partial thread portion The wall surface of each tap groove is formed by the back surface of the thread portion preceding during thread formation and the rake face of the subsequent thread portion following the preceding thread portion located on the side opposite to the back surface. The arrangement position of the differently arranged coolant supply groove is the position closer to the back surface side of the preceding thread portion, which is the tap described in Supplementary Invention 5 above. The "preceding thread portion" refers to the thread portion that precedes thread formation (for example, cutting first), and the "subsequent thread portion" refers to the thread portion that follows the preceding thread portion. One tap groove forms a tap groove with the back surface of the subsequent thread portion and the rake face of the preceding thread portion as opposing groove wall surfaces. [Supplementary Invention 7] Coolant supply groove with different arrangement near partial thread portion The differently arranged coolant supply groove has a groove cross-sectional area smaller than that of the other coolant supply grooves, a groove depth shallower than that of the other coolant supply grooves, or a coolant jet supply amount smaller than that of the other coolant supply grooves, which is the tap described in any one of Supplementary Inventions 5 and 6 above. [Supplementary Invention 8] Coolant supply groove with different arrangement near (partial / total) thread portion A tap body having a thread portion for forming an internal thread and a shank portion, Tap grooves formed between adjacent thread portions, A coolant supply groove provided on the outer periphery of the shank portion for supplying coolant from the rear end side of the shank portion to all or some of the respective tap grooves. A tap, wherein all or part of the arrangement position of the coolant supply groove is closer to the thread portion side than the center position line (B) of the tap groove (however, excluding the form in which a through coolant supply hole provided in a through hole form from the rear end side of the shank portion to the tip side of the thread portion is provided for supplying coolant from the rear end side of the shank and discharging it from the tip side of the thread portion). [Supplementary Invention 9] Coolant supply groove with different arrangements closer to the thread portion (partial or total) A tap body having a thread portion for forming an internal thread and a shank portion. Tap grooves formed between adjacent thread portions. A coolant supply groove provided on the outer periphery of the shank portion for supplying coolant from the rear end side of the shank portion to all or some of the respective tap grooves. The wall surface of each tap groove is formed by the back surface of the preceding thread portion and the rake face of the following V that follows the preceding thread portion and is located on the opposite side of the back surface during thread formation. A tap, wherein all or part of the arrangement position of the coolant supply groove is closer to the back surface side of the preceding thread portion (however, excluding the form in which a through coolant supply hole provided in a through hole form from the rear end side of the shank portion to the tip side of the thread portion is provided for supplying coolant from the rear end side of the shank and discharging it from the tip side of the thread portion). [Supplementary Invention 10] A tap body having a thread portion for forming an internal thread and a shank portion. Tap grooves formed between adjacent thread portions. A coolant supply groove provided on the outer periphery of the shank portion for supplying coolant from the rear end side of the shank portion to all or some of the respective tap grooves. A tap, wherein all or part of the arrangement position of the coolant supply groove is closer to the thread portion side than the center position line (B) of the tap groove. [Supplementary Invention 11] A tap body having a thread portion and a shank portion that form an internal thread, A tap groove formed between adjacent thread portions, A coolant supply groove provided on the outer periphery of the shank portion for supplying coolant from the rear end side of the shank portion to all or some of the respective tap grooves, The tap groove communicated with the coolant supply groove has a deep tap groove portion located on the tip side of the tap and a shallow tap groove portion having a shallower form than the deep tap groove portion located on the full thread portion side, The shallow tap groove portion is a form in which the coolant supply groove is formed, a tap (for example, the tap of Example (16)). [Supplementary Invention 12] A tap body having a thread portion and a shank portion that form an internal thread, A tap groove formed between adjacent thread portions, A coolant supply groove provided on the outer periphery of the shank portion for supplying coolant from the rear end side of the shank portion to all or some of the respective tap grooves, At least one of the tap grooves is a narrow-width tap groove having a narrow groove width, The tap grooves other than the narrow-width tap groove have a wide groove width and are wide-width tap grooves, The coolant supply groove communicates with the narrow-width tap groove and is a narrow-width tap groove coolant supply groove for supplying the coolant to the narrow-width tap groove, a tap (for example, the tap of Example (17)). [Supplementary Invention 13] A wide-width groove coolant supply groove that is a coolant supply groove communicating with the wide-width tap groove is provided, The form of the wide-width groove coolant supply groove has a groove depth shallower than the groove depth of the narrow-width tap groove coolant supply groove and a groove width narrower than the groove width of the narrow-width tap groove coolant supply groove, The tap according to Supplementary Invention 12 (for example, the tap of Example (18)), having a cross-sectional area smaller than that of the narrow tap groove coolant supply groove, a supply amount of the coolant smaller than the groove width of the narrow tap groove coolant supply groove, or a flow rate slower than the flow rate of the coolant in the narrow tap groove coolant supply groove. [Effect of Supplementary Invention] [Effect of Supplementary Invention 1] Chip discharge groove communication coolant supply groove "At least one of the coolant supply grooves is a chip discharge groove communication coolant supply groove having a groove width different from that of other coolant supply grooves, a groove depth different from that of other coolant supply grooves, or a groove width and a groove depth different from those of other coolant supply grooves, Since the groove cross-sectional area of the chip discharge groove communication coolant supply groove is smaller than the groove cross-sectional area of the other coolant supply grooves, the following operational effects are achieved. (1) In the thread formation of a through hole, coolant is supplied to all tap grooves. Although the coolant supply amount from the chip discharge groove communication coolant supply groove is smaller than that from other coolant supply grooves (because the groove cross-sectional area of the chip discharge groove communication coolant supply groove is smaller than that of other coolant supply grooves), in the tap groove receiving the jet supply from such a chip discharge groove communication coolant supply groove, the cutting edge is cooled by the supplied coolant, the frictional resistance is reduced, and the cut chips are pushed downward by the coolant and quickly discharged from the lower opening of the pilot hole. (2) In the thread formation of a blind hole, the supply amount of the coolant from the chip discharge groove communication coolant supply groove to the tap groove (chip discharge groove) is smaller than the supply amount of the coolant from other coolant supply grooves to the tap groove (chip entry prevention groove). On the other hand, the amount of coolant supplied to the other tap groove (chip entry prevention groove) is larger than the amount of coolant supplied to the tap groove (chip discharge groove). Therefore, in the blind hole, the coolant (including chips) in other coolant supply grooves does not push up the coolant (including chips) in the chip discharge groove communication coolant supply groove, or flows to the side with less influence of the coolant, and directly rises through the tapping groove (chip discharge groove) to discharge the coolant and chips from the upper opening of the bottom hole (the upper opening of the tapping groove hole formed by the tapping groove (chip discharge groove) and the bottom hole). This achieves the following operational effect. That is, a tap that can be used without problems even when using a blind hole is realized. (3) From (1) and (2) above, a tap that realizes a cooling effect, a friction reduction effect, and a chip discharge effect (hereinafter also referred to as a "tap corresponding to both bottom holes") is realized both in the use of through holes and in the use of blind holes. For example, when there is a mixture of forming the same diameter thread in a blind hole and forming the same diameter thread in a through hole, it can be handled with one type of the same diameter tap. For example, since the tap can be only one type of the tap corresponding to both bottom holes, there is no need to manage the taps for blind holes and through holes separately, and mistakes such as using a tap for a through hole in a blind hole can be avoided, simplifying the management of taps. [Effect of the Supplementary Invention 2] Chip discharge groove communication coolant supply groove Since it has the configuration of "at least one of the coolant supply grooves is a chip discharge groove communication coolant supply groove having a groove depth shallower than the groove depths of the other coolant supply grooves", the following operational effects are achieved. It means that the injection position of the coolant from the chip discharge groove communication coolant supply groove is a position away from the bottom surface of the tapping groove to the outside, the injection range is in a thin form, and the injection supply amount of the coolant is less than the coolant amount of the other coolant supply grooves. It is such that the supply thickness of the coolant is thin and it is close to the edge of the bottom hole opening (female threads are formed during thread formation). That is, since it is at a position away from the bottom surface of the tap groove, the coolant supplied by injection is injected to the side closer to the wall surface (female thread surface) of the bottom hole of the hole (hereinafter also referred to as "tap groove hole") formed by the tap groove and the bottom hole. Therefore, the coolant is concentrated and injected at a location close to the wall surface of the bottom hole of the tap groove hole, and the coolant injection distribution (hereinafter also referred to as "outer large amount inner small amount coolant injection distribution") is such that the injection amount decreases as it goes toward the bottom surface side of the tap groove. Due to the outer large amount inner small amount coolant injection distribution, it becomes a discharge flow path for the coolant and chips of other coolant supply grooves to flow in, rise, and be discharged outside the bottom hole on the bottom surface side of the tap groove where the suppression of the coolant from the chip discharge groove connection coolant supply groove is weak, and the smooth discharge of the coolant and chips is realized, achieving the following operational effect. That is, in the case of use in a blind hole, a form is realized in which it is impossible or difficult to suppress the inflow of the coolant and chips of other coolant supply grooves into the tap groove supplied by the chip discharge groove connection coolant supply groove and the discharge to the outside. Therefore, the discharge of the chips and coolant is realized more smoothly. [Effect of Supplementary Invention 3] Small coolant supply groove "At least one of the coolant supply grooves is a small coolant supply groove in which the injection supply amount of the coolant is less than the injection supply amount of the coolant in other coolant supply grooves," so it has the same effect as the above-mentioned Supplementary Invention 1. [Effect of Supplementary Invention 4] Small coolant supply groove In the above-mentioned Supplementary Invention 3, "at the rear end of the shank portion, a coolant introduction groove for introducing coolant into each of the coolant supply grooves is provided, and the groove cross-sectional area of the introduction groove of the small coolant supply groove is smaller than the groove cross-sectional area of the introduction groove of the other coolant supply grooves," so it has the following operational effects. For example, in a form where the groove cross-sectional area of the introduction groove of the small amount coolant supply groove is the same as the groove cross-sectional area of the introduction groove of other coolant supply grooves, the amount of coolant in the small amount coolant supply groove is less than that in other coolant supply grooves, so it has the effect of making its injection momentum weak. Therefore, in the use of the stop hole, the force for suppressing the discharge of chips and coolant can be reduced, and thus it is possible to more smoothly discharge chips and coolant from the tap groove that receives the supply of coolant from the small amount coolant supply groove. [Effect of Supplementary Invention 5] Different-arrangement coolant supply groove "At least one of the coolant supply grooves is a different-arrangement coolant supply groove (a position deviated from the central position line (B) of the tap groove toward the thread portion side) whose arrangement position is closer to the thread portion side than the central position line (B) of the tap groove, and the arrangement positions of the other coolant supply grooves are provided on the substantially central position line (B) of the tap groove," so it has the following effects. (1) Since the coolant supply groove is provided at a position deviated from the central position line (B) of the tap groove, the position where the coolant flows is biased. Therefore, with respect to the coolant flow pressure on the side where the coolant supply groove is located, which is one side of the central position line (B), the flow pressure on the side where the other coolant supply groove is not located, which is the other side of the central position line (B), becomes smaller. Thus, the other side of the tap groove is in a state where the amount of coolant is less and the flow pressure is smaller (a state that can also be called a flow path) compared to the one side. In the screw formation of the stop hole, the coolant and chips of the other coolant supply grooves flow in and rise from the other side, which is the place (flow path) where the flow pressure of the coolant in the tap groove where the different-arrangement coolant supply groove flows is small and the flow rate is low, and are discharged from the lower hole opening, or flow into the tap groove where the different-arrangement coolant supply groove flows, rise, and are discharged outside the lower hole from the other side while resisting the coolant in the different-arrangement coolant supply groove, thus having the effect. (2) In the case of a tap in a form (a general form) where a square portion (a portion gripped on the chuck side so that the tap does not slip and rotate) is provided at the rear end of the shank, and the angular position and the thread portion position of the square portion are the same on the axis, the central position line (B) of the other coolant supply groove is at the center of the side that is not an angle of the square portion. Since this side center is a thin-walled portion located inside the outer periphery of the shank, the introduction groove provided at the end of the square portion for introducing coolant from the square portion to the other coolant supply groove becomes shallow, and the groove cross-sectional area of the introduction groove becomes small. Therefore, the amount of coolant introduced is reduced. However, in the fifth supplementary invention of the present application, since the differently arranged coolant supply groove is provided at a position closer to the thread portion side than the central position line (B) of the tap groove, the introduction groove provided in the square portion is located closer to the corner side than the center of the side. Therefore, it has the effect that the introduction groove can be made deeper than the introduction groove on the central position line (B). This means that if the same amount of coolant supply as the other coolant supply grooves is obtained, the introduction groove can be made shallower, which means that the strength of the shank is increased. In the form where the amount of coolant in the differently arranged coolant supply groove is less than the coolant supply amount of the other coolant supply grooves, it further has the effect that the differently arranged coolant supply groove can be made shallower. [Effect of Supplementary Invention 6] Differently arranged coolant supply groove In the above-mentioned fifth supplementary invention, since the configuration is "the arrangement position of the differently arranged coolant supply groove is a position closer to the back surface side of the preceding thread portion", it has the same effect as the above-mentioned fifth supplementary invention and the following effects. (1) During the rotation thread forming operation of the tap, in the tap groove portion outside the pilot hole, the air pressure (wind pressure) generated by the rotation directly hits the rake face of the subsequent thread portion and easily flows out of the tap groove. Therefore, the closer the coolant is to the rake face, the more it is pushed out of the tap groove by the wind pressure and flows out. On the other hand, since the back surface of the leading thread portion is a place where the wind pressure does not directly act (is not applied), the coolant injected and supplied from the differently arranged coolant supply groove provided at a position closer to the back surface side of the leading thread portion to the tap groove is not directly hit by the wind pressure generated by the rotation of the tap. Therefore, more coolant is supplied into the pilot hole and reaches the tip of the tap, achieving the following operational effect. (2) As a result of (1) above, since more coolant can be supplied to the pilot hole, the differently arranged coolant supply groove can be formed in a shallower groove shape than other coolant supply grooves, achieving the following operational effects: the supply amount of the coolant can be reduced, or the injection supply flow rate of the coolant can be decreased. (3) As a result of (2) above, the differently arranged coolant supply groove can be made shallower. The formation of a shallow groove can strengthen and toughen the shank (the thicker the part of the shank without the groove (solid core part) as the groove is shallower), achieving the following operational effect. [Effect of Supplementary Invention 7] Differently Arranged Coolant Supply Groove In any of the above Supplementary Inventions 5 and 6, since the differently arranged coolant supply groove has a groove cross-sectional area smaller than that of the other coolant supply grooves, a groove depth shallower than that of the other coolant supply grooves, or an injection supply amount of the coolant smaller than that of the other coolant supply grooves, it achieves the same operational effects as those of any of Supplementary Inventions 5 and 6. [Effect of Supplementary Invention 8] Differently Arranged Coolant Supply Groove Since the configuration is such that "the arrangement position of all or part of the coolant supply groove is closer to the thread portion side than the center line (B) of the tap groove", the following operational effects are achieved. (1) The form in which one arrangement position of the coolant supply groove is closer to the thread portion side than the center line (B) of the tap groove corresponds to the differently arranged coolant supply groove of Supplementary Invention 5 above, achieving the same operational effects as those of Supplementary Invention 5. Also, for example, in the form where the two coolant supply grooves are non-uniformly arranged coolant supply grooves, if the coolant supply amount is the same as that of the coolant supply groove on the central position line (B), the groove depth can be made shallower, so that the strength of the shank can be made stronger (the shallower the groove, the thicker the non-grooved part (solid core part) of the shank). (2) In the form where all the arrangement positions of the coolant supply grooves are closer to the threaded part side than the central position line (B) of the tap groove, since all of the coolant supply grooves can be made into shallow grooves, the strength of the shank can be made even stronger (the shallower the groove, the thicker the non-grooved part (solid core part) of the shank), and this has the effect described above. [Effect of Supplementary Invention 9] Non-uniformly arranged coolant supply grooves Since it has the configuration of "the arrangement position of all or part of the coolant supply grooves is closer to the back surface side of the preceding threaded part", it has the following effects. (1) In the form where one arrangement position of the coolant supply groove is closer to the back surface side of the threaded part, it has the same effect as the effect of Supplementary Invention 6 described above. Also, in the form where the two arrangement positions of the coolant supply grooves are closer to the back side of the threaded part, it has the effect of making the strength of the shank stronger (the shallower the groove, the thicker the non-grooved part (solid core part) of the shank). (2) In the form where all the arrangement positions of the coolant supply grooves are closer to the back surface side of the threaded part, it has the effect of increasing the amount of coolant reaching the tap tip (thread engaging part). If the amount of coolant reaching the tap tip is not increased (not increased from the same amount as the coolant supply amount of the coolant supply groove provided on the central position line (B) of the tap groove), the coolant supply amount can be reduced, and this can be achieved by making the coolant supply groove shallower. Therefore, forming a shallow coolant supply groove has the effect of making the strength of the shank even stronger (the shallower the groove, the thicker the non-grooved part (solid core part) of the shank).

Industrial Applicability

[0083] The present invention is mainly used in industries that manufacture and use cutting tools such as cutting taps, roll taps, and reamers.

Explanation of Signs

[0084] A: Pilot hole, B: Central position line, 1: Cutting tap, 2: Engaging part, 3: Full thread part, 4: Thread part, 4a: First thread part, 4b: Second thread part, 4c: Third thread part, 4d: Fourth thread part, 4e: Fifth thread part, 4f: Sixth thread part, 5: Shank part, 6: Square part, 7: Tap body, 9a: First tap groove (chip discharge groove), 9b: Second tap groove (chip entry prevention groove), 9c: Third tap groove (chip entry prevention groove), 9d: Fourth tap groove (chip entry prevention groove), 9e: Fifth tap groove (chip entry prevention groove), 9f: Sixth tap groove (chip entry prevention groove), 9g: Seventh tap groove (chip discharge groove), 10a: First coolant supply groove (chip discharge groove connection coolant supply groove, small amount coolant supply groove), 10b: Second coolant supply groove, 10c: Third coolant supply groove, 10d: Fourth coolant supply groove, 11: Coolant reservoir, 12a: First coolant introduction groove, 12b: Second coolant introduction groove, 12c: Third coolant introduction groove, 12d: Fourth coolant introduction groove, 13a~13d: Cutting edges, 14a~14d: Rake faces, 15a~15d: Back side, 20: Cutting tap, 21a: First coolant supply groove (chip discharge groove connecting coolant supply groove, small amount coolant supply groove, differently arranged coolant supply groove), 22a: First coolant introduction groove, 25: Cutting tap, 26: Tap body, 29: First coolant introduction groove 29, 30: Cutting tap, 33a: First coolant supply groove (chip discharge groove connecting coolant supply groove, small amount coolant supply groove, differently arranged coolant supply groove), 34: Cutting tap, 36a: First coolant supply groove (chip discharge groove connecting coolant supply groove, small amount coolant supply groove, differently arranged coolant supply groove), 37: Cutting tap, 40a: First coolant supply groove (chip discharge groove connecting coolant supply groove, small amount coolant supply groove, differently arranged coolant supply groove), 44: Cutting tap, 45b: Second coolant supply groove, 45c: Third coolant supply groove, 45d: Fourth coolant supply groove, 46b: Second coolant introduction groove, 46c: Third coolant introduction groove, 46d: Fourth coolant introduction groove, 50: Cutting tap, 51a: First coolant supply groove, 51b: Second coolant supply groove, 51c: Third coolant supply groove, 51d: Fourth coolant supply groove, 52a: First coolant introduction groove, 52b: Second coolant introduction groove, 52c: Third coolant introduction groove, 52d: Fourth coolant introduction groove, 55: Cutting tap, 63a: First coolant supply groove, 63b: Second coolant supply groove, 63c: Third coolant supply groove, 63d: Fourth coolant supply groove, 64a: First coolant introduction groove, 64b: Second coolant introduction groove, 64c: Third coolant introduction groove, 64d: Fourth coolant introduction groove, 65: Cutting tap, 68a~68d: Rear surface 69: Shank, 70: Cutting tap, 73a~73d: Rear surface 74: Cutting tap, 79a: First coolant supply groove, 79b: Second coolant supply groove, 79c: Third coolant supply groove, 79d: Fourth coolant supply groove, 80: Cutting tap, 81a: First coolant supply groove, 81b: Second coolant supply groove, 81c: Third coolant supply groove, 81d: Fourth coolant supply groove, 82: Groove end point, 83: Cutting tap, 84a: First coolant supply groove, 84b: Second coolant supply groove, 84b1: First groove part, 84d2: Second groove part, 84c: Third coolant supply groove, 84d: Fourth coolant supply groove, 84g: Sixth coolant supply groove, 84d1: First groove part, 84d2: Fourth groove part, 9b1: Second shallow tap groove part, 9b2: Second deep tap groove part, 9c1: Second shallow tap groove part, 9c2: Second deep tap groove part, 9d1: Fourth shallow tapping groove part, 9d2: Fourth deep tapping groove part, 9e1: Fifth shallow tapping groove part, 9e2: Fifth deep tapping groove part, 9f1: Sixth shallow tapping groove part, 9f2: Sixth deep tapping groove part, 87: Cutting tap, 89: Cutting tap, 90: Cutting tap, 92: Cutting tap, 94b: Raised part, 94d: Raised part, 95b: Second coolant supply groove, 95d: Fourth coolant supply groove, 98b: Raised part, 98d: Raised part, 99b: Second coolant supply groove, 99d: Fourth coolant supply groove, 100: Cutting tap, 102: Cutting tap, 103b: Partition wall, 103d: Partition wall, 104b: Back side groove, 104d: Back side groove, 105b: Cutting surface side groove, 105d: Cutting surface side groove, 106: Cutting tap, 107: Inclined surface end point, 109: Cutting tap, 111: Cutting tap, 113: Cutting tap.

Claims

1. A tap body having a plurality of thread portions each having a biting portion and a full thread portion, and a shank portion communicating with the thread portions; A tap groove formed between adjacent ones of the thread portions; A coolant supply groove provided on an outer periphery of the shank portion for supplying coolant from a rear end side of the shank portion to all or some of the tap grooves; and The tap is characterized in that all or part of the groove form of the coolant supply groove is a non-through groove form in which the groove extends to a position of at least approximately 1 / 3 of the tap groove within the range of the full thread portion and has a groove end point (82), or a through groove form having no groove end point (82) penetrating the tap groove.

2. A tap body having a plurality of thread portions each having a biting portion and a full thread portion, and a shank portion communicating with the thread portions; A tap groove formed between adjacent ones of the thread portions; A coolant supply groove provided on an outer periphery of the shank portion for supplying coolant from a rear end side of the shank portion to all or some of the tap grooves; and The tap groove form has a shallow tap groove portion in which all or part of the form of the tap groove is a shallow groove form extending from the shank side toward the tip of the tap, and a deep tap groove portion located on the tip side of the tap relative to the shallow tap groove portion and extending toward the tip of the tap and having a groove form deeper than the shallow tap groove portion; The tap is characterized in that the length of the shallow tap groove portion is a length form extending to a position of at least approximately 1 / 3 of the tap groove within the range of the full thread portion.

3. The tap according to claim 2, wherein the shallow tap groove portion is in a form in which the coolant supply groove is formed in a through form.

4. A tap body having a plurality of thread portions each having a biting portion and a full thread portion, and a shank portion communicating with the thread portions; A tap groove formed between adjacent ones of the thread portions; A coolant supply groove provided on an outer periphery of the shank portion for supplying coolant from a rear end side of the shank portion to all or some of the tap grooves; and The tap is characterized in that a raised portion is provided in all or part of the axial direction of the tap groove, the raised portion being formed in a form that rises from the groove bottom of the tap groove and communicates with the shank portion and is within the range of the full thread portion toward the tip of the tap.

5. 5. The tap according to claim 4, wherein the raised portion is in the form in which the coolant supply groove is formed.

6. A tap body having a plurality of threaded portions each having a chamfer portion and a complete thread portion, and a shank portion connected to the threaded portions; a tap groove formed between adjacent threaded portions; A coolant supply groove is provided on the outer periphery of the shank portion for supplying coolant from a rear end side of the shank portion to all or some of the tap grooves, In the whole or a part of the tap groove, a partition wall is provided at a height that does not contact the female thread formed in the pilot hole, and is connected to the shank portion and is formed in a form that fits within the range of the complete thread portion toward the tap tip side, The tap is characterized in that the tap groove 9d is divided into two grooves by the partition wall, thereby forming a back surface groove and a cutting surface groove.

7. 7. The tap according to claim 6, wherein the coolant supply groove is connected to the back surface groove or the cutting surface groove.

8. A tap body having a plurality of threaded portions each having a cutting portion and a complete thread portion, and a shank portion connected to the threaded portions; a tap groove formed between adjacent threaded portions; A coolant supply groove is provided on the outer periphery of the shank portion for supplying coolant from a rear end side of the shank portion to all or some of the tap grooves, In the case where the pilot hole for forming the female thread is a blind hole, A part of the tap groove functions as a chip intrusion prevention groove, the chip entry prevention groove is connected to the coolant supply groove and functions as a groove that releases chips into a pilot hole space, which is a space of the pilot hole expanding forward of the threaded portion, depending on the amount and / or force of the coolant supplied, and does not allow the chips to enter the chip entry prevention groove; The tap grooves other than the chip entry prevention grooves function as chip discharge grooves that move within the grooves so that coolant containing chips discharged from the chip entry prevention grooves into the pilot hole space is discharged to the outside from a pilot hole opening that is an opening of the pilot hole, The groove width of the chip intrusion prevention groove is narrower than the groove width of the chip discharge groove, a groove form of the coolant supply groove connected to the chip entry prevention groove, the groove extending to a position approximately 1 / 3 or more of the tap groove in the range of the complete thread portion and having a groove end point (82) is a non-through groove form, or a through groove form that does not have the groove end point (82) that passes through the tap groove.

9. A tap body having a plurality of threaded portions each having a cutting portion and a complete thread portion, and a shank portion connected to the threaded portions; a tap groove formed between adjacent threaded portions; A coolant supply groove is provided on the outer periphery of the shank portion for supplying coolant from a rear end side of the shank portion to all or some of the tap grooves, In the case where the pilot hole for forming the female thread is a blind hole, A part of the tap groove functions as a chip intrusion prevention groove, the chip entry prevention groove is connected to the coolant supply groove and functions as a groove that releases chips into a pilot hole space, which is a space of the pilot hole expanding forward of the threaded portion, depending on the amount and / or force of the coolant supplied, and does not allow the chips to enter the chip entry prevention groove; The tap grooves other than the chip entry prevention grooves function as chip discharge grooves that move within the grooves so that coolant containing chips discharged from the chip entry prevention grooves into the pilot hole space is discharged to the outside from a pilot hole opening that is an opening of the pilot hole, The groove width of the chip intrusion prevention groove is narrower than the groove width of the chip discharge groove, The groove form of the chip intrusion prevention groove has a shallow tap groove portion which is a shallow groove form extending from the shank side toward the tip of the tap, and a deep tap groove portion which is a groove form deeper than the shallow tap groove portion and is located on the tap tip side than the shallow tap groove portion, The tap is characterized in that the coolant supply groove connected to the chip entry prevention groove has a shallow groove penetrating form that penetrates the shallow tap groove portion and is configured to release coolant to the deep tap groove portion.

Images